- fixed yet another C++ comment inside a .c file

strings/ctype-mb.c

@@ -292,7 +292,7 @@ uint my_instr_mb(CHARSET_INFO *cs,
         match->end= 0;
         match->mblen= 0;
       }
-      return 1;		// Empty string is always found
+      return 1;		/* Empty string is always found */
     }
     
     big0= big;