toolbox: Fix uninitalized stack variable in mount.

Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/toolbox/mount.c b/toolbox/mount.c
index ef13e1f..86047a9 100644
--- a/toolbox/mount.c
+++ b/toolbox/mount.c
@@ -223,7 +223,7 @@
 {
 	char *type = NULL;
 	int c;
-	int loop;
+	int loop = 0;
 
 	progname = argv[0];
 	rwflag = MS_VERBOSE;