MDEV-13893 encryption.innodb-redo-badkey failed in buildbot with page cannot be decrypted

buf_dblwr_process(): Remove the useless warning that a copy of a page
in the doublewrite buffer is corrupted. We already report an error if a
corrupted page cannot be recovered from the doublewrite buffer.

Note: In MariaDB 10.1, the original bug reported in MDEV-13893 could
still be easily repeatable. In MariaDB 10.2.24, MDEV-12699 should
have reduced the probability considerably.

storage/innobase/buf/buf0dblwr.cc

@@ -612,20 +612,13 @@ buf_dblwr_process()
 
 		ulint decomp = fil_page_decompress(buf, page);
 		if (!decomp || (decomp != srv_page_size && zip_size)) {
-			goto bad_doublewrite;
+			continue;
 		}
 
 		if (expect_encrypted && mach_read_from_4(
 			    page + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION)
 		    ? !fil_space_verify_crypt_checksum(page, zip_size)
 		    : buf_page_is_corrupted(true, page, zip_size, space())) {
-			if (!is_all_zero) {
-bad_doublewrite:
-				ib_logf(IB_LOG_LEVEL_WARN,
-					"A doublewrite copy of page "
-					ULINTPF ":" ULINTPF " is corrupted.",
-					space_id, page_no);
-			}
 			/* Theoretically we could have another good
 			copy for this page in the doublewrite
 			buffer. If not, we will report a fatal error

storage/xtradb/buf/buf0dblwr.cc

@@ -612,20 +612,13 @@ buf_dblwr_process()
 
 		ulint decomp = fil_page_decompress(buf, page);
 		if (!decomp || (decomp != srv_page_size && zip_size)) {
-			goto bad_doublewrite;
+			continue;
 		}
 
 		if (expect_encrypted && mach_read_from_4(
 			    page + FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION)
 		    ? !fil_space_verify_crypt_checksum(page, zip_size)
 		    : buf_page_is_corrupted(true, page, zip_size, space())) {
-			if (!is_all_zero) {
-bad_doublewrite:
-				ib_logf(IB_LOG_LEVEL_WARN,
-					"A doublewrite copy of page "
-					ULINTPF ":" ULINTPF " is corrupted.",
-					space_id, page_no);
-			}
 			/* Theoretically we could have another good
 			copy for this page in the doublewrite
 			buffer. If not, we will report a fatal error