usrmount: Fix miss-detection of btrfs subvolumes.

This causes the root FS options to be incorrectly applied to to /usr
In some cases this can cause boot failure e.g. due to and XFS /usr
not supporting the 'acl' option from the ext4 root FS.

https://bugs.mageia.org/show_bug.cgi?id=9884

modules.d/98usrmount/mount-usr.sh

@@ -61,14 +61,14 @@ mount_usr()
                 LABEL=*)
                     _dev="$(echo $_dev | sed 's,/,\\x2f,g')"
                     _dev="/dev/disk/by-label/${_dev#LABEL=}"
-		    ;;
+                    ;;
                 UUID=*)
                     _dev="${_dev#block:}"
                     _dev="/dev/disk/by-uuid/${_dev#UUID=}"
                     ;;
             esac
             if strstr "$_opts" "subvol=" && \
-                [ "${root#block:}" -ef $_dev ]
+                [ "${root#block:}" -ef $_dev ] && \
                 [ -n "$rflags" ]; then
                 # for btrfs subvolumes we have to mount /usr with the same rflags
                 rflags=$(filtersubvol "$rflags")