fix mountpoint test to not prevemt mkfs_xxx from making image in any file

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/fsck_minix.c b/util-linux/fsck_minix.c
index ca0b17e..5d1d2af 100644
--- a/util-linux/fsck_minix.c
+++ b/util-linux/fsck_minix.c
@@ -374,7 +374,7 @@
  */
 static void check_mount(void)
 {
-	if (find_mount_point(device_name)) {
+	if (find_mount_point(device_name, 0)) {
 		int cont;
 #if ENABLE_FEATURE_MTAB_SUPPORT
 		/*