btrfs: fix zero size inode with non-zero size after log replay

In the Linux kernel, the following vulnerability has been resolved:

btrfs: don't BUG() on unexpected delayed ref type in runonedelayedref()

There is no need to BUG(), we can just return an error and log an error message.

In the Linux kernel, the following vulnerability has been resolved:

btrfs: add missing RCU unlock in error path in tryreleasesubpageextentbuffer()

Call rcureadlock() before exiting the loop in tryreleasesubpageextentbuffer() because there is a rcureadunlock() call past the loop.

This has been detected by the Clang thread-safety analyzer.