ceph, rbd: delete unnecessary checks before two function calls

The functions ceph_put_snap_context() and iput() test whether their
argument is NULL and then return immediately. Thus the test around the
call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[idryomov@redhat.com: squashed rbd.c hunk, changelog]
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>

drivers/block/rbd.c

@@ -3405,7 +3405,6 @@ static void rbd_handle_request(struct rbd_device *rbd_dev, struct request *rq)
 	if (result)
 		rbd_warn(rbd_dev, "%s %llx at %llx result %d",
 			 obj_op_name(op_type), length, offset, result);
-	if (snapc)
 	ceph_put_snap_context(snapc);
 	blk_end_request_all(rq, result);
 }

fs/ceph/caps.c

@@ -3137,7 +3137,6 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 done:
 	mutex_unlock(&session->s_mutex);
 done_unlocked:
-	if (inode)
 	iput(inode);
 	return;
 

fs/ceph/mds_client.c

@@ -524,7 +524,6 @@ void ceph_mdsc_release_request(struct kref *kref)
 	}
 	if (req->r_locked_dir)
 		ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
-	if (req->r_target_inode)
 	iput(req->r_target_inode);
 	if (req->r_dentry)
 		dput(req->r_dentry);
@@ -1066,7 +1065,6 @@ static int iterate_session_caps(struct ceph_mds_session *session,
 	session->s_cap_iterator = NULL;
 	spin_unlock(&session->s_cap_lock);
 
-	if (last_inode)
 	iput(last_inode);
 	if (old_cap)
 		ceph_put_cap(session->s_mdsc, old_cap);

fs/ceph/snap.c

@@ -365,7 +365,6 @@ static int build_snap_context(struct ceph_snap_realm *realm)
 	     realm->ino, realm, snapc, snapc->seq,
 	     (unsigned int) snapc->num_snaps);
 
-	if (realm->cached_context)
 	ceph_put_snap_context(realm->cached_context);
 	realm->cached_context = snapc;
 	return 0;
@@ -590,14 +589,12 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm)
 		if (!inode)
 			continue;
 		spin_unlock(&realm->inodes_with_caps_lock);
-		if (lastinode)
 		iput(lastinode);
 		lastinode = inode;
 		ceph_queue_cap_snap(ci);
 		spin_lock(&realm->inodes_with_caps_lock);
 	}
 	spin_unlock(&realm->inodes_with_caps_lock);
-	if (lastinode)
 	iput(lastinode);
 
 	list_for_each_entry(child, &realm->children, child_item) {