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

2 files changed, 5 insertions, 5 deletions

diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index bbaef45d..989228b9 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)));
diff --git a/src/logging.c b/src/logging.c
index 8dfc31ed..1ab8767f 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -214,7 +214,7 @@ static const char* color(int subsys)
 }
 
 static void _output(struct log_target *target, unsigned int subsys,
-		    unsigned int level, char *file, int line, int cont,
+		    unsigned int level, const char *file, int line, int cont,
 		    const char *format, va_list ap)
 {
 	char buf[4096];
@@ -264,7 +264,7 @@ err:
 }
 
 /*! \brief vararg version of logging function */
-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)
 {
 	struct log_target *tar;
@@ -314,7 +314,7 @@ void osmo_vlogp(int subsys, int level, char *file, int line,
 	}
 }
 
-void logp(int subsys, char *file, int line, int cont,
+void logp(int subsys, const char *file, int line, int cont,
 	  const char *format, ...)
 {
 	va_list ap;
@@ -324,7 +324,7 @@ void logp(int subsys, char *file, int line, int cont,
 	va_end(ap);
 }
 
-void logp2(int subsys, unsigned int level, char *file, int line, int cont, const char *format, ...)
+void logp2(int subsys, unsigned int level, const char *file, int line, int cont, const char *format, ...)
 {
 	va_list ap;