Commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab breaks Smack TCP connections

[Casey Schaufler]

Commit f211ac154577ec9ccf07c15f18a6abf0d9bdb4ab 'net: correct
sk_acceptq_is_full()' breaks a system with the Smack LSM.
Reverting this change results in a return to correct behavior.

The Smack testsuite can be found at:
	https://github.com/smack-team/smack-testsuite.git

The failing test is ipv4-tcp-local-peersec.sh, but it seems
that most TCP connections hang with SYN_SENT. Oddly, ssh
to 127.0.0.1 works, but other TCP connections timeout.