autofs: fix print format for ioctl warning message

All other warnings use "cmd(0x%08x)" and this is the only one with
"cmd(%d)".  (below comes from my userspace debug program, but not
automount daemon)

[ 1139.905676] autofs4:pid:1640:check_dev_ioctl_version: ioctl control interface version mismatch: kernel(1.0), user(0.0), cmd(-1072131215)

Link: http://lkml.kernel.org/r/20160812024851.12352.75458.stgit@pluto.themaw.net
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Ian Kent <ikent@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/autofs4/dev-ioctl.c

@@ -75,7 +75,7 @@ static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
 	if ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) ||
 	    (param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) {
 		pr_warn("ioctl control interface version mismatch: "
-			"kernel(%u.%u), user(%u.%u), cmd(%d)\n",
+			"kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n",
 			AUTOFS_DEV_IOCTL_VERSION_MAJOR,
 			AUTOFS_DEV_IOCTL_VERSION_MINOR,
 			param->ver_major, param->ver_minor, cmd);