smc: simplify abort logic

Some of the conditions to exit recv() are common in two pathes - cleaning up
code by moving the check up so we have it only once.

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com&gt;&lt;>
Signed-off-by: David S. Miller <davem@davemloft.net>