put_unused_fd() if anon_inode_getfile() fails.

How do you think about to add any tags (like “Fixes” and “Cc”) accordingly?

See also:
* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v7.2-rc2#n145
* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/stable-kernel-rules.rst?h=v7.2-rc2#n34



* Would you like to complete the exception handling by using another goto chain?

* How do you think about to increase the application of scope-based resource management?


Regards,
Markus