Consistenly format variables in */Makefile.am files

Change-Id: Ifa21513c007072314097b7bec188579972dc1694
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am
index 6a95315..02c8878 100644
--- a/openbsc/src/gprs/Makefile.am
+++ b/openbsc/src/gprs/Makefile.am
@@ -1,50 +1,126 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
-AM_CFLAGS=-Wall -fno-strict-aliasing $(LIBOSMOCORE_CFLAGS) \
-	$(LIBOSMOGSM_CFLAGS) $(LIBOSMOVTY_CFLAGS) $(LIBOSMOCTRL_CFLAGS) \
-	$(LIBOSMOABIS_CFLAGS) $(LIBOSMOGB_CFLAGS) $(COVERAGE_CFLAGS) \
-	$(LIBCARES_CFLAGS) $(LIBCRYPTO_CFLAGS) $(LIBGTP_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir) \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	-fno-strict-aliasing \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOVTY_CFLAGS) \
+	$(LIBOSMOCTRL_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOGB_CFLAGS) \
+	$(COVERAGE_CFLAGS) \
+	$(LIBCARES_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(LIBGTP_CFLAGS) \
+	$(NULL)
 if BUILD_IU
-AM_CFLAGS += $(LIBASN1C_CFLAGS) $(LIBOSMOSIGTRAN_CFLAGS) $(LIBOSMORANAP_CFLAGS)
+AM_CFLAGS += \
+	$(LIBASN1C_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
+	$(LIBOSMORANAP_CFLAGS) \
+	$(NULL)
 endif
 
-OSMO_LIBS = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) \
-	    $(LIBOSMOCTRL_LIBS) $(LIBOSMOGB_LIBS)
+OSMO_LIBS = \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBOSMOCTRL_LIBS) \
+	$(LIBOSMOGB_LIBS) \
+	$(NULL)
 
-bin_PROGRAMS = osmo-gbproxy
-
+bin_PROGRAMS = \
+	osmo-gbproxy \
+	$(NULL)
 if HAVE_LIBGTP
 if HAVE_LIBCARES
-bin_PROGRAMS += osmo-sgsn osmo-gtphub
+bin_PROGRAMS += \
+	osmo-sgsn \
+	osmo-gtphub \
+	$(NULL)
 endif
 endif
 
-osmo_gbproxy_SOURCES =  gb_proxy.c gb_proxy_main.c gb_proxy_vty.c \
-			gb_proxy_patch.c gb_proxy_tlli.c gb_proxy_peer.c \
-			gprs_gb_parse.c gprs_llc_parse.c crc24.c gprs_utils.c
-osmo_gbproxy_LDADD = 	$(top_builddir)/src/libcommon/libcommon.a \
-			$(OSMO_LIBS) $(LIBCRYPTO_LIBS) -lrt
+osmo_gbproxy_SOURCES = \
+	gb_proxy.c \
+	gb_proxy_main.c \
+	gb_proxy_vty.c \
+	gb_proxy_patch.c \
+	gb_proxy_tlli.c \
+	gb_proxy_peer.c \
+	gprs_gb_parse.c \
+	gprs_llc_parse.c \
+	crc24.c \
+	gprs_utils.c \
+	$(NULL)
+osmo_gbproxy_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	$(NULL)
 
-osmo_sgsn_SOURCES =	gprs_gmm.c gprs_sgsn.c gprs_sndcp.c gprs_sndcp_vty.c \
-			sgsn_main.c sgsn_vty.c sgsn_libgtp.c \
-			gprs_llc.c gprs_llc_parse.c gprs_llc_vty.c crc24.c \
-			sgsn_ctrl.c sgsn_auth.c gprs_subscriber.c \
-			gprs_utils.c gprs_gsup_client.c \
-			sgsn_cdr.c sgsn_ares.c \
-			oap.c oap_messages.c gprs_llc_xid.c
-osmo_sgsn_LDADD = 	\
-			$(top_builddir)/src/libcommon/libcommon.a
+osmo_sgsn_SOURCES = \
+	gprs_gmm.c \
+	gprs_sgsn.c \
+	gprs_sndcp.c \
+	gprs_sndcp_vty.c \
+	sgsn_main.c \
+	sgsn_vty.c \
+	sgsn_libgtp.c \
+	gprs_llc.c \
+	gprs_llc_parse.c \
+	gprs_llc_vty.c \
+	crc24.c \
+	sgsn_ctrl.c \
+	sgsn_auth.c \
+	gprs_subscriber.c \
+	gprs_utils.c \
+	gprs_gsup_client.c \
+	sgsn_cdr.c \
+	sgsn_ares.c \
+	oap.c \
+	oap_messages.c \
+	gprs_llc_xid.c \
+	$(NULL)
+osmo_sgsn_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(OSMO_LIBS) \
+	$(LIBOSMOABIS_LIBS) \
+	$(LIBCARES_LIBS) \
+	$(LIBCRYPTO_LIBS) \
+	-lrt \
+	-lgtp \
+	$(NULL)
 if BUILD_IU
-osmo_sgsn_LDADD +=	$(top_builddir)/src/libiu/libiu.a
-endif
-osmo_sgsn_LDADD +=	-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) \
-			$(LIBCRYPTO_LIBS) -lrt
-if BUILD_IU
-osmo_sgsn_LDADD +=	$(LIBOSMOSIGTRAN_LIBS) $(LIBOSMORANAP_LIBS) $(LIBASN1C_LIBS)
+osmo_sgsn_LDADD += \
+	$(top_builddir)/src/libiu/libiu.a \
+	$(LIBOSMOSIGTRAN_LIBS) \
+	$(LIBOSMORANAP_LIBS) \
+	$(LIBASN1C_LIBS) \
+	$(NULL)
 endif
 
-osmo_gtphub_SOURCES =	gtphub_main.c gtphub.c gtphub_sock.c gtphub_ares.c \
-			gtphub_vty.c sgsn_ares.c gprs_utils.c
-osmo_gtphub_LDADD = 	\
-			$(top_builddir)/src/libcommon/libcommon.a \
-			-lgtp $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBOSMOVTY_LIBS) \
-			$(LIBCARES_LIBS) -lrt
+osmo_gtphub_SOURCES = \
+	gtphub_main.c \
+	gtphub.c \
+	gtphub_sock.c \
+	gtphub_ares.c \
+	gtphub_vty.c \
+	sgsn_ares.c \
+	gprs_utils.c \
+	$(NULL)
+osmo_gtphub_LDADD = \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(LIBOSMOVTY_LIBS) \
+	$(LIBCARES_LIBS) \
+	-lrt \
+	-lgtp \
+	$(NULL)