btrfs-progs: check: add experimental flag for lowmem mode

The experimental flag is already carried in the manpage, but was removed from the btrfs check usage message as part of refactoring via 87c1bd13c1fca430c3dbf0da62e9aa33bde609c8. Add it back.

Signed-off-by David Disseldorp <[email protected]>

Reviewed-by Nikolay Borisov <[email protected]>

---
  check/main.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

check/main.c +1 -1

index 3190b5d4..9aca0c09 100644
@@ -9386,7 +9386,7 @@ const char * const cmd_check_usage[] = {
  	"                            original - read inodes and extents to memory (requires",
  	"                                       more memory, does less IO)",
  	"                            lowmem   - try to use less memory but read blocks again",
-	"                                       when needed",
+	"                                       when needed (experimental)",
  	"--check-data-csum           verify checksums of data blocks",
  	"-Q|--qgroup-report          print a report on qgroup consistency",
  	"-E|--subvol-extents <subvolid>",

The experimental flag is already carried in the manpage, but was removed from the btrfs check usage message as part of refactoring via 87c1bd13c1fca430c3dbf0da62e9aa33bde609c8. Add it back.

Signed-off-by David Disseldorp <[email protected]>

Reviewed-by Nikolay Borisov <[email protected]>