Description: compat: fix 4-byte infoleak via uninitialized struct field
References:
 https://bugs.chromium.org/p/project-zero/issues/detail?id=1574
Notes:
Bugs:
upstream: released (4.17-rc5) [0a0b98734479aa5b3c671d5190e86273372cab95]
4.9-upstream-stable: N/A "Vulnerable code introduced later"
3.16-upstream-stable: N/A "Vulnerable code introduced later"
3.2-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (4.16.12-1)
4.9-stretch-security: N/A "Vulnerable code introduced later"
3.16-jessie-security: N/A "Vulnerable code introduced later"
3.2-wheezy-security: N/A "Vulnerable code introduced later"