staging: lustre: lnet: remove null check before kfree

Since kfree(NULL) is safe there is no need to place a check before it.
Issue reported by checkpatch.pl

Signed-off-by: Sumit Pundir <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/lustre/lnet/lnet/lib-move.c

···
 	the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
 	lnet_net_unlock(cpt);
 
-	if (msg)
-		kfree(msg);
+	kfree(msg);
 
 	return NULL;
 }