Annotate mbp_log as having printf parameters

Author: gaul

src/util.h

@@ -1,6 +1,6 @@
 #ifndef _UTIL_H_
 #define _UTIL_H_
 
-void mbp_log(int level, const char *fmt, ...);
+void mbp_log(int level, const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
 
 #endif