fxp_fstat_recv: remove unreachable cleanup code.

Coverity pointed out a call to sftp_pkt_free(pktin) straight after an
unconditional return statement, which is obviously silly.

Fortunately, it was benign: pktin was freed anyway by the function
being called _by_ the return statement, so the unreachability of this
free operation prevented a double-free rather than allowing a memory
leak. So the right fix is to just remove the code, rather than
arranging for it to be run.

sftp.c

@@ -596,8 +596,6 @@ bool fxp_fstat_recv(struct sftp_packet *pktin, struct sftp_request *req,
     sfree(req);
     if (pktin->type == SSH_FXP_ATTRS) {
         return fxp_got_attrs(pktin, attrs);
-	sftp_pkt_free(pktin);
-	return true;
     } else {
 	fxp_got_status(pktin);
         sftp_pkt_free(pktin);