btrfs-progs: fix argv0_buf handling

The variable argv0_buf was duplicated and the changes done in utils.c
were not propagated to help.c. So if an unknown commandline token was
found, the error message did not contain the known part:

 $ btrfs scrub test
 : unknown token 'test'

instead of

 $ btrfs scrub test
 btrfs scrub: uknown token 'test'

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

1 files changed, 5 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index f34c27b7..17837377 100644
--- a/utils.c
+++ b/utils.c
@@ -54,6 +54,11 @@ static int btrfs_scan_done = 0;
 
 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
 
+const char *get_argv0_buf(void)
+{
+	return argv0_buf;
+}
+
 void fixup_argv0(char **argv, const char *token)
 {
 	int len = strlen(argv0_buf);