btrfs-progs: let test_issubvolume return the exact error

Return any error from stat, minor cleanups.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/commands.h b/commands.h
index d2bb093..2da093b 100644
--- a/commands.h
+++ b/commands.h
@@ -126,7 +126,7 @@ int cmd_debug_tree(int argc, char **argv);
 int cmd_rescue(int argc, char **argv);
 
 /* subvolume exported functions */
-int test_issubvolume(char *path);
+int test_issubvolume(const char *path);
 
 /* send.c */
 char *get_subvol_name(char *mnt, char *full_path);