Fix MSAN complaint about uninitialized (and unused) value

Change-Id: Ia83f6a548726c7e277990f9ddfc7286065047307
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/73028
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@google.com>
diff --git a/src/Device/Renderer.cpp b/src/Device/Renderer.cpp
index b80ee46..93d2993 100644
--- a/src/Device/Renderer.cpp
+++ b/src/Device/Renderer.cpp
@@ -285,11 +285,7 @@
 	data->layer = layer;
 	data->instanceID = instanceID;
 	data->baseVertex = baseVertex;
-
-	if(indexBuffer)
-	{
-		draw->indexType = pipeline->getIndexBuffer().getIndexType();
-	}
+	draw->indexType = indexBuffer ? pipeline->getIndexBuffer().getIndexType() : VK_INDEX_TYPE_UINT16;
 
 	draw->vertexRoutine = vertexRoutine;