libosmogapk: drop an 'osmo' prefix from internal log variables

It would be better to have an 'osmo_gapk' prefix for exposed
symbols only. Both internal logging variables aren't exposed,
so they shouldn't have one.
diff --git a/include/osmocom/gapk/logging.h b/include/osmocom/gapk/logging.h
index eaa82ab..60376f1 100644
--- a/include/osmocom/gapk/logging.h
+++ b/include/osmocom/gapk/logging.h
@@ -20,9 +20,9 @@
 
 #include <osmocom/core/logging.h>
 
-extern int osmo_gapk_log_init_complete;
-extern int osmo_gapk_log_subsys;
+extern int gapk_log_init_complete;
+extern int gapk_log_subsys;
 
 #define LOGPGAPK(level, fmt, args...) \
-	if (osmo_gapk_log_init_complete) \
-		LOGP(osmo_gapk_log_subsys, level, fmt, ## args)
+	if (gapk_log_init_complete) \
+		LOGP(gapk_log_subsys, level, fmt, ## args)
diff --git a/src/common.c b/src/common.c
index 9448362..c7c5c32 100644
--- a/src/common.c
+++ b/src/common.c
@@ -28,11 +28,11 @@
 }
 
 /* Internal GAPK logging */
-int osmo_gapk_log_init_complete = 0;
-int osmo_gapk_log_subsys;
+int gapk_log_init_complete = 0;
+int gapk_log_subsys;
 
 void osmo_gapk_log_init(int subsys)
 {
-	osmo_gapk_log_subsys = subsys;
-	osmo_gapk_log_init_complete = 1;
+	gapk_log_subsys = subsys;
+	gapk_log_init_complete = 1;
 }