staging: csr: sme_blocking.c: add missing check for return of sme_wait_for_reply

sme_ap_config misses a check of the return of the sme_wait_for_reply
as all other functions do here, for the return of sme_wait_for_reply
add the check and fail if it returns other than 0.

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>