commit 4495ec6d upstream.

When getting flags, a response to a different message would
result in a deadlock because of a missing unlock.  Add that
unlock and a comment.  Found by static analysis.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>