Fix warnings about possibly uninitialized variables

storage/innobase/buf/buf0flu.cc

@@ -965,7 +965,7 @@ buf_flush_init_for_writing(
 		}
 	}
 
-	uint32_t checksum;
+	uint32_t checksum = BUF_NO_CHECKSUM_MAGIC;
 
 	switch (srv_checksum_algorithm_t(srv_checksum_algorithm)) {
 	case SRV_CHECKSUM_ALGORITHM_INNODB:
@@ -988,7 +988,6 @@ buf_flush_init_for_writing(
 		break;
 	case SRV_CHECKSUM_ALGORITHM_NONE:
 	case SRV_CHECKSUM_ALGORITHM_STRICT_NONE:
-		checksum = BUF_NO_CHECKSUM_MAGIC;
 		mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM,
 				checksum);
 		break;

storage/innobase/dict/dict0dict.cc

@@ -6981,6 +6981,7 @@ dict_foreign_qualify_index(
 		}
 
 		if (dict_col_is_virtual(field->col)) {
+			col_name = "";
 			for (ulint j = 0; j < table->n_v_def; j++) {
 				col_name = dict_table_get_v_col_name(table, j);
 				if (innobase_strcasecmp(field->name,col_name) == 0) {