[PATCH v2 1/2] xfs: fix incorrect argument count check

[Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>]

t_mmap_dio.c actually requires 4 arguments, not 3 as the current check
enforces:

	# ./src/t_mmap_dio
	usage: t_mmap_dio <src file> <dest file> <size> <msg>
	# ./src/t_mmap_dio  one two three
	open src(No such file or directory) len 0 (null)

Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Fixes: 456581661b4d ("xfs: test per-inode DAX flag by IO")
---
 src/t_mmap_dio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/t_mmap_dio.c b/src/t_mmap_dio.c
index 69b9ca8..6c8ca1a 100644
--- a/src/t_mmap_dio.c
+++ b/src/t_mmap_dio.c
@@ -39,7 +39,7 @@ int main(int argc, char **argv)
 	char *dfile;
 	unsigned long len, opt;
 
-	if (argc < 4)
+	if (argc < 5)
 		usage(basename(argv[0]));
 
 	while ((opt = getopt(argc, argv, "b")) != -1)
-- 
2.9.3