qcacmn: Fix out of bound read issue in FILS Indication IE parse

When parsing FILS Indication IE, the data pointer is not
validated while moving the pointer which may cause
out of bound issue.

Validate data pointer before moving pointer.

Change-Id: Ib20f78fe58d7a4c8f9245e6b8d28212499cc6f50
CRs-Fixed: 2842475