logging: Fix compile breakage introduced by the warning fixes
Make sure the declaration and definition match, add const to
the functions called by logp/logp2.
Compile output:
logging.c:317: error: conflicting types for 'logp'
../include/osmocom/core/logging.h:34: note: previous declaration of 'logp' was here
logging.c:327: error: conflicting types for 'logp2'
../include/osmocom/core/logging.h:168: note: previous declaration of 'logp2' was here
make[3]: *** [logging.lo] Error 1
diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index bbaef45..989228b 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -28,7 +28,7 @@
#endif
-void osmo_vlogp(int subsys, int level, char *file, int line,
+void osmo_vlogp(int subsys, int level, const char *file, int line,
int cont, const char *format, va_list ap);
void logp(int subsys, const char *file, int line, int cont, const char *format, ...) __attribute__ ((format (printf, 5, 6)));