ext4: fix error code return to user-space in ext4getbranch()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.9.337 by commit 0735746664c0d494eeafaf62a729447f792eb32c. For more details please see the references link.