external: libpng: fix numerous compiler warnings

Clean up the code for unused variables to handle them
a bit more elegantly.

Change-Id: I8b01c27673128719dad74276599d5a286c4dd412

1 files changed, 2 insertions, 2 deletions

diff --git a/pngwrite.c b/pngwrite.c
index 1d8c53f..646c3d3 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1586,8 +1586,8 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 
-   transforms = transforms; /* Quiet compiler warnings */
-   params = params;
+   UNUSED(transforms); /* Quiet compiler warnings */
+   UNUSED(params);
 }
 #endif
 #endif /* PNG_WRITE_SUPPORTED */