Fix compiler warnings

include/m_string.h

@@ -249,8 +249,7 @@ extern ulonglong strtoull(const char *str, char **ptr, int base);
 
 extern size_t my_vsnprintf(char *str, size_t n,
                            const char *format, va_list ap);
-extern size_t my_snprintf(char *to, size_t n, const char *fmt, ...)
-  ATTRIBUTE_FORMAT(printf, 3, 4);
+extern size_t my_snprintf(char *to, size_t n, const char *fmt, ...);
 
 #if defined(__cplusplus)
 }

mysys/mf_iocache2.c

@@ -437,7 +437,7 @@ size_t my_b_vprintf(IO_CACHE *info, const char* fmt, va_list args)
       /* TODO: implement precision */
       if (backtick_quoting)
       {
-        size_t total= my_b_write_backtick_quote(info, (uchar *) par, length2);
+        size_t total= my_b_write_backtick_quote(info, par, length2);
         if (total == (size_t)-1)
           goto err;
         out_length+= total;