btrfs-progs: cleanup, update function definitions to be ANSI conformant

Sparse reports:

 warning: non-ANSI function declaration of function

and we're using func(void) elsewhere.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/btrfs-calc-size.c b/btrfs-calc-size.c
index 88f92e1..7287858 100644
--- a/btrfs-calc-size.c
+++ b/btrfs-calc-size.c
@@ -421,7 +421,7 @@ out:
 	return ret;
 }
 
-static void usage()
+static void usage(void)
 {
 	fprintf(stderr, "Usage: calc-size [-v] [-b] <device>\n");
 }