Revert "btrfs: avoid monopolizing a core when activating a swap file"

This reverts commit 3d770d44.

The backport for linux-5.4.y, commit 3d770d44 ("btrfs: avoid
monopolizing a core when activating a swap file"), inserted
cond_resched() in the wrong location.

Revert it now; a subsequent commit will re-backport the original patch.

Fixes: 3d770d44 ("btrfs: avoid monopolizing a core when activating a swap file") # linux-5.4.y
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>