linux-phytec-fsl

rxrpc: Fix a potential NULL-pointer deref in rxrpc_abort_calls

The call pointer in a channel on a connection will be NULL if there's no
active call on that channel.  rxrpc_abort_calls() needs to check for this
before trying to take the call's state_lock.

Signed-off-by: David Howells <dhowells@redhat.com>