Fix argument comment createAlpha in avifincrtest

tests/avifincrtest.c

diff --git a/tests/avifincrtest.c b/tests/avifincrtest.c
index 3c81f75..fe04616 100644
--- a/tests/avifincrtest.c
+++ b/tests/avifincrtest.c
@@ -135,7 +135,7 @@
         if (!encodeDecodeNonIncrementallyAndIncrementally(reference,
                                                           reference->width,
                                                           reference->height,
-                                                          /*createAlpha=*/AVIF_TRUE,
+                                                          /*createAlphaIfNone=*/AVIF_TRUE,
                                                           flatCells,
                                                           /*encodedAvifIsPersistent=*/AVIF_TRUE,
                                                           /*giveSizeHint=*/AVIF_TRUE,