Fix uninitialized variable compiler warning in VGetNextConsume (#108)

Pass the address of pDecodedItem->uNextNestLevel directly to
ConsumeItem.
diff --git a/src/qcbor_decode.c b/src/qcbor_decode.c
index b1cec82..801761f 100644
--- a/src/qcbor_decode.c
+++ b/src/qcbor_decode.c
@@ -2767,13 +2767,11 @@
 
 void QCBORDecode_VGetNextConsume(QCBORDecodeContext *pMe, QCBORItem *pDecodedItem)
 {
-   uint8_t    uNextNestLevel;
-
    QCBORDecode_VGetNext(pMe, pDecodedItem);
 
    if(pMe->uLastError == QCBOR_SUCCESS) {
-      pMe->uLastError = (uint8_t)ConsumeItem(pMe, pDecodedItem, &uNextNestLevel);
-      pDecodedItem->uNextNestLevel = uNextNestLevel;
+      pMe->uLastError = (uint8_t)ConsumeItem(pMe, pDecodedItem,
+         &pDecodedItem->uNextNestLevel);
    }
 }