BUG#42445 Warning messages in innobase/handler/ha_innodb.cc

      
There was a type casting problem in the storage/innobase/handler/ha_innodb.cc,
(int ha_innobase::write_row(...)). Innobase uses has an internal error variable
of type 'ulint' while mysql uses an 'int'. 
      
To fix the problem the function manipulates an error variable of
type 'ulint' and only casts it into 'int' when needs to return the value.

storage/innobase/handler/ha_innodb.cc

@@ -3577,7 +3577,8 @@ ha_innobase::write_row(
 			/* out: error code */
 	uchar*	record)	/* in: a row in MySQL format */
 {
-	int		error = 0;
+	ulint		error = 0;
+        int             error_result= 0;
 	ibool		auto_inc_used= FALSE;
 	ulint		sql_command;
 	trx_t*		trx = thd_to_trx(user_thd);
@@ -3693,6 +3694,7 @@ no_commit:
 			}
 
 			/* MySQL errors are passed straight back. */
+			error_result = (int) error;
 			goto func_exit;
 		}
 
@@ -3786,7 +3788,7 @@ set_max_autoinc:
 				err = innobase_set_max_autoinc(auto_inc);
 
 				if (err != DB_SUCCESS) {
-					error = (int) err;
+					error = err;
 				}
 			}
 			break;
@@ -3796,12 +3798,12 @@ set_max_autoinc:
 	innodb_srv_conc_exit_innodb(prebuilt->trx);
 
 report_error:
-	error = convert_error_code_to_mysql(error, user_thd);
+	error_result = convert_error_code_to_mysql((int) error, user_thd);
 
 func_exit:
 	innobase_active_small();
 
-	DBUG_RETURN(error);
+	DBUG_RETURN(error_result);
 }
 
 /**************************************************************************