Improve readability by generalizing the profile validity checks,
I had to read through those if statements half a dozen times on my
first try just to get an idea of what's happening there.

Signed-off-by: Alexandru Moise <redacted>
---
 fs/btrfs/volumes.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fbe7c10..d23bc26 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c

@@ -3454,6 +3454,15 @@ static void __cancel_balance(struct btrfs_fs_info *fs_info)
 	atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
 }
 
+/* Non-zero return value signifies invalidity */
+static inline int balance_relocate_invalid(struct btrfs_balance_args *bctl_arg,