Fix a MSVC compiler warning

Change-Id: I00f679d181d24ffe8462394d65bbeae732612fd5
diff --git a/examples/lightfield_bitstream_parsing.c b/examples/lightfield_bitstream_parsing.c
index 71d4dec..7768e27 100644
--- a/examples/lightfield_bitstream_parsing.c
+++ b/examples/lightfield_bitstream_parsing.c
@@ -104,6 +104,7 @@
     case AOM_IMG_FMT_I44416: return 48;
     default: die("Invalid image format");
   }
+  return 0;
 }
 
 int main(int argc, char **argv) {