Bug #48739 MySQL crashes on specific INTERVAL in select query

Fixed crash caused by x64 int/long incompatibility introduced
in Bug #29125.

sql/item_timefunc.cc:
  Fixed crash caused by int/long incompatibility on x64 systems.
  
  Changed two "uint" casts and a "long" declartion to "int" in order to
  ensure that the integer sign is preserved.
  
  See Bug #48739 for details.

sql/item_timefunc.cc

@@ -386,7 +386,7 @@ static bool extract_date_time(DATE_TIME_FORMAT *format,
 	if (tmp - val > 6)
 	  tmp= (char*) val + 6;
 	l_time->second_part= (int) my_strtoll10(val, &tmp, &error);
-	frac_part= 6 - (uint) (tmp - val);
+	frac_part= 6 - (int) (tmp - val);
 	if (frac_part > 0)
 	  l_time->second_part*= (ulong) log_10_int[frac_part];
 	val= tmp;
@@ -876,9 +876,9 @@ static bool get_interval_info(const char *str,uint length,CHARSET_INFO *cs,
       value= value*LL(10) + (longlong) (*str - '0');
     if (transform_msec && i == count - 1) // microseconds always last
     {
-      long msec_length= 6 - (uint) (str - start);
+      int msec_length= 6 - (int)(str - start);
       if (msec_length > 0)
-	value*= (long) log_10_int[msec_length];
+        value*= (long)log_10_int[msec_length];
     }
     values[i]= value;
     while (str != end && !my_isdigit(cs,*str))