Btrfs: remove reduplicate check about root in the function btrfs_clean_quota_tree
Btrfs: remove reduplicate check about root in the function btrfs_clean_quota_tree

The check work has been done just before the function btrfs_clean_quota_tree
is called, it is not necessary to check it again, remove it.

Signed-off-by: Wang Shilong <2619f00d4b1c70e3aae124ec60dac0e454c5a3a3@cn.fujitsu.com>
Signed-off-by: Josef Bacik <631dfb3d07694fdcf26abc7aac2c6c2b641f8bde@fusionio.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas