cosmetic: Do not indent header includes inside extern C block

Change-Id: I3091d917a13e45b3aef8e52a53dcafa308581652
diff --git a/src/tbf.cpp b/src/tbf.cpp
index 5e222ae..444cec0 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -43,9 +43,9 @@
 #include <osmocom/core/stats.h>
 #include <osmocom/core/logging.h>
 #include <osmocom/core/timer_compat.h>
-	#include <osmocom/core/bitvec.h>
-	#include <osmocom/core/rate_ctr.h>
-	#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/core/bitvec.h>
+#include <osmocom/core/rate_ctr.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
 }
 
 #include <errno.h>