Description: virt: acrn: fix a memory leak in acrn_dev_ioctl()
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2083455
 https://lore.kernel.org/all/20220308092047.1008409-1-butterflyhuangxx@gmail.com/
Notes:
 bwh> This driver was added in 5.12-rc1.
Bugs:
upstream: released (5.18-rc1) [ecd1735f14d6ac868ae5d8b7a2bf193fa11f388b]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
4.9-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.17.3-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"
4.9-stretch-security: N/A "Vulnerable code not present"