block: refactor bdrv_remove_file_or_backing_child to bdrv_remove_child

Now the function can remove any child, so give it more common name.
Drop assertions and drop bs argument which becomes unused. Function
would be reused in a further commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220726201134.924743-16-vsementsov@yandex-team.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

@@ -92,9 +92,7 @@ static bool bdrv_recurse_has_child(BlockDriverState *bs,
 
 static void bdrv_replace_child_noperm(BdrvChild *child,
                                       BlockDriverState *new_bs);
-static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
-                                              BdrvChild *child,
-                                              Transaction *tran);
+static void bdrv_remove_child(BdrvChild *child, Transaction *tran);
 static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
                                             Transaction *tran);
 
@@ -3342,7 +3340,7 @@ static int bdrv_set_file_or_backing_noperm(BlockDriverState *parent_bs,
 
     if (child) {
         bdrv_unset_inherits_from(parent_bs, child, tran);
-        bdrv_remove_file_or_backing_child(parent_bs, child, tran);
+        bdrv_remove_child(child, tran);
     }
 
     if (!child_bs) {
@@ -5023,26 +5021,19 @@ static bool should_update_child(BdrvChild *c, BlockDriverState *to)
     return ret;
 }
 
-static void bdrv_remove_filter_or_cow_child_commit(void *opaque)
+static void bdrv_remove_child_commit(void *opaque)
 {
     GLOBAL_STATE_CODE();
     bdrv_child_free(opaque);
 }
 
-static TransactionActionDrv bdrv_remove_filter_or_cow_child_drv = {
-    .commit = bdrv_remove_filter_or_cow_child_commit,
+static TransactionActionDrv bdrv_remove_child_drv = {
+    .commit = bdrv_remove_child_commit,
 };
 
-/*
- * A function to remove backing or file child of @bs.
- * Function doesn't update permissions, caller is responsible for this.
- */
-static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
-                                              BdrvChild *child,
-                                              Transaction *tran)
+/* Function doesn't update permissions, caller is responsible for this. */
+static void bdrv_remove_child(BdrvChild *child, Transaction *tran)
 {
-    assert(child == bs->backing || child == bs->file);
-
     if (!child) {
         return;
     }
@@ -5051,7 +5042,7 @@ static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
         bdrv_replace_child_tran(child, NULL, tran);
     }
 
-    tran_add(tran, &bdrv_remove_filter_or_cow_child_drv, child);
+    tran_add(tran, &bdrv_remove_child_drv, child);
 }
 
 /*
@@ -5062,7 +5053,7 @@ static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
 static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
                                             Transaction *tran)
 {
-    bdrv_remove_file_or_backing_child(bs, bdrv_filter_or_cow_child(bs), tran);
+    bdrv_remove_child(bdrv_filter_or_cow_child(bs), tran);
 }
 
 static int bdrv_replace_node_noperm(BlockDriverState *from,