qcacld-3.0: Possible memory leak in __iw_setnone_getint api

Dynamically allocated memory is not freed in error case
for sme_config in set none get int api, this may lead to
mem leak in error case.

Free the dynamically alolocated memory in error case.
Change-Id: I8db2be12412709c48cdbb2466c20e15415c576ca
CRs-Fixed: 2466334