btrfs: remove unnecessary mkpath call

The existence of the original volume should imply the existence of its
parent directory, after all... And with the new typed subdirectories
this was wrong.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/PVE/Storage/BTRFSPlugin.pm

@@ -529,9 +529,6 @@ sub volume_snapshot {
         $snap_path = raw_file_to_subvol($snap_path);
     }
 
-    my $snapshot_dir = $class->get_subdir($scfg, 'images') . "/$vmid";
-    mkpath $snapshot_dir;
-
     $class->btrfs_cmd(['subvolume', 'snapshot', '-r', '--', $path, $snap_path]);
     return undef;
 }