Fix warning C4838 : conversion from 'type_1' to 'type_2' requires a narrowing conversion.

sql/field.cc

@@ -5059,7 +5059,10 @@ int Field_timestamp::store_TIME_with_warning(THD *thd, const Datetime *dt,
   }
 
   // Adjust and store the value
-  timeval tv= {timestamp, (uint) l_time->second_part};
+  timeval tv;
+  tv.tv_sec= timestamp;
+  tv.tv_usec= l_time->second_part;
+
   my_timeval_trunc(&tv, decimals());
   store_TIMEVAL(tv);
 

sql/field.h

@@ -2756,7 +2756,9 @@ class Field_timestamp :public Field_temporal {
   }
   void store_TIME(my_time_t timestamp, ulong sec_part)
   {
-    timeval tv= {timestamp, (uint) sec_part};
+    timeval tv;
+    tv.tv_sec= timestamp;
+    tv.tv_usec= sec_part;
     my_timeval_trunc(&tv, decimals());
     store_TIMEVAL(tv);
   }