block: Drop errp parameter from blk_new()

blk_new() cannot fail so its Error ** parameter has become superfluous.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/blockdev.c b/blockdev.c
index 7d4a1ba..af0b022 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -567,11 +567,7 @@
     if ((!file || !*file) && !qdict_size(bs_opts)) {
         BlockBackendRootState *blk_rs;
 
-        blk = blk_new(errp);
-        if (!blk) {
-            goto early_err;
-        }
-
+        blk = blk_new();
         blk_rs = blk_get_root_state(blk);
         blk_rs->open_flags    = bdrv_flags;
         blk_rs->read_only     = !(bdrv_flags & BDRV_O_RDWR);