[script] Remove "Aborting on <line>" message

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/image/script.c

 		return 0;
 
 	/* Execute command */
-	if ( ( rc = system ( line ) ) != 0 ) {
-		printf ( "Aborting on \"%s\"\n", line );
+	if ( ( rc = system ( line ) ) != 0 )
 		return rc;
-	}
 
 	return 0;
 }