btrfs/174: Adjust error message when setting compressed flag

Following kernel commit "btrfs: add missing check for nocow and
compression inode flags" btrfs refuses setting +c on +C files during
validation of the args. Account for this by adjusting the expected
error message.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

tests/btrfs/174

@@ -47,7 +47,7 @@ $LSATTR_PROG -l "$swapfile" | _filter_scratch | _filter_spaces
 
 # Compression we reject outright.
 echo "Enable compression"
-$CHATTR_PROG +c "$swapfile" 2>&1 | grep -o "Text file busy"
+$CHATTR_PROG +c "$swapfile" 2>&1 | grep -o "Invalid argument while setting flags"
 $LSATTR_PROG -l "$swapfile" | _filter_scratch | _filter_spaces
 
 echo "Snapshot"

tests/btrfs/174.out

@@ -2,7 +2,7 @@ QA output created by 174
 Disable nocow
 SCRATCH_MNT/swapvol/swap No_COW
 Enable compression
-Text file busy
+Invalid argument while setting flags
 SCRATCH_MNT/swapvol/swap No_COW
 Snapshot
 Text file busy