fix clang warnings

include/my_time.h

@@ -118,7 +118,7 @@ longlong number_to_datetime(longlong nr, ulong sec_part, MYSQL_TIME *time_res,
 static inline
 longlong double_to_datetime(double nr, MYSQL_TIME *ltime, uint flags, int *cut)
 {
-  if (nr < 0 || nr > LONGLONG_MAX)
+  if (nr < 0 || nr > (double)LONGLONG_MAX)
     nr= (double)LONGLONG_MAX;
   return number_to_datetime((longlong) floor(nr),
                             (ulong)((nr-floor(nr))*TIME_SECOND_PART_FACTOR),

storage/connect/ha_connect.cc

@@ -1317,7 +1317,7 @@ char *ha_connect::GetRealString(PCSZ s)
 {
   char *sv;
 
-  if (IsPartitioned() && s && partname && *partname) {
+  if (IsPartitioned() && s && *partname) {
     sv= (char*)PlugSubAlloc(xp->g, NULL, 0);
     sprintf(sv, s, partname);
     PlugSubAlloc(xp->g, NULL, strlen(sv) + 1);