syntax fix: superfluous ';' which caused a problem with gcc 2.95

sql-common/my_time.c:
  superfluous ; which caused a problem with gcc 2.95

sql-common/my_time.c

@@ -578,7 +578,7 @@ bool str_to_time(const char *str, uint length, MYSQL_TIME *l_time,
 void init_time(void)
 {
   time_t seconds;
-  struct tm *l_time,tm_tmp;;
+  struct tm *l_time,tm_tmp;
   MYSQL_TIME my_time;
   bool not_used;