ap: Fix invalid length argument to ap_build_beacon_pr_head

Previously resp was a simple array of bytes allocated on the stack.
This was changed to a dynamically allocated array, but the sizeof(resp)
argument to ap_build_beacon_pr_head() was never changed appropriately.

Fix this by introducing a new resp_len variable that holds the number of
bytes allocated for resp.  Also, move the allocation after the basic
sanity checks have been performed to avoid allocating/freeing memory

Fixes: 18a63f91fd44 ("ap: Write extra frame IEs from the user")
1 file changed