MDEV-12253 post-fix: Do not leak memory in crash recovery

This fixes the cmake -DWITH_ASAN test failure that was mentioned
in commit f9cc3918 (merging
MDEV-12253 from 10.1 to 10.2).

fil_parse_write_crypt_data(): If the tablespace is not found,
invoke fil_space_destroy_crypt_data(&crypt_data) to properly
free the created object.

With this, the test encryption.innodb-redo-badkey still reports
"Missing MLOG_FILE_NAME or MLOG_FILE_DELETE before MLOG_CHECKPOINT"
but does not fail. The misleading message should be corrected,
maybe as part of MDEV-12699.

storage/innobase/fil/fil0crypt.cc

@@ -502,16 +502,16 @@ fil_parse_write_crypt_data(
 	ptr += len;
 
 	/* update fil_space memory cache with crypt_data */
-	fil_space_t* space = fil_space_acquire_silent(space_id);
-
-	if (space) {
+	if (fil_space_t* space = fil_space_acquire_silent(space_id)) {
 		crypt_data = fil_space_set_crypt_data(space, crypt_data);
 		fil_space_release(space);
-	}
-
-	/* Check is used key found from encryption plugin */
-	if (crypt_data->should_encrypt() && !crypt_data->is_key_found()) {
-		*err = DB_DECRYPTION_FAILED;
+		/* Check is used key found from encryption plugin */
+		if (crypt_data->should_encrypt()
+		    && !crypt_data->is_key_found()) {
+			*err = DB_DECRYPTION_FAILED;
+		}
+	} else {
+		fil_space_destroy_crypt_data(&crypt_data);
 	}
 
 	return ptr;