Fix all clang warnings
diff --git a/src/read.c b/src/read.c
index 1a0ad89..0ca2015 100644
--- a/src/read.c
+++ b/src/read.c
@@ -156,7 +156,7 @@
 
     uint16_t itemCount;
     CHECK(avifStreamReadU16(&s, &itemCount)); // unsigned int(16) item_count;
-    for (int itemIndex = 0; itemIndex < itemCount; ++itemIndex) {
+    for (int i = 0; i < itemCount; ++i) {
         uint16_t itemID;                                           // unsigned int(16) item_ID;
         CHECK(avifStreamReadU16(&s, &itemID));                     //
         uint16_t dataReferenceIndex;                               // unsigned int(16) data_reference_index;