Minor fix for mc_log_mark() macro.

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

src/logging.h

@@ -11,7 +11,7 @@
    events into a central log file that can be used for debugging.
  */
 
-#define mc_log_mark() mc_log("%s:%d\n",__FILE,__LINE__)
+#define mc_log_mark() mc_log("%s:%d\n",__FILE__,__LINE__)
 
 extern void mc_log(const char *, ...)
 	__attribute__((__format__(__printf__,1,2)));