Remove unused local variable to fix the build

Change-Id: Ic0a77a754b649d360d07eaa9e6a93274e7eaf0a8
diff --git a/cryptfs.c b/cryptfs.c
index 9c84fe5..187cf48 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -3436,7 +3436,6 @@
  * sequence and its index is greater than or equal to index. Return 0 otherwise.
  */
 static int match_multi_entry(const char *key, const char *field, unsigned index) {
-    unsigned int i;
     unsigned int field_len;
     unsigned int key_index;
     field_len = strlen(field);