video: msm: wfd: Delete from free_queue before freeing memory

VSG has a stale pointer to deallocated memory that is accessed, causing
a page fault.

Change-Id: I036293950795f601c0592c39b6da20d3c0cbb77f
CRs-Fixed: 348977
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>