shithub: rgbds

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Make randtilegen report the file names it fails to open

Which of the two is erroring out can be inferred from the file name,
anyway.

--- a/test/gfx/randtilegen.c

+++ b/test/gfx/randtilegen.c

@@ -232,7 +232,7 @@

 			int len = sprintf(filename, "%s%" PRIu16 ".rng", argv[index], i);

 			rngRecorder = fopen(filename, "wb");

 			if (!rngRecorder) {

-				perror("RNG fopen");

+				perror(filename);

 				return 1;

 			}

@@ -239,7 +239,7 @@

 			filename[len - 3] = 'p'; // `.rng` -> `.png`

 			FILE *img = fopen(filename, "wb");

 			if (!img) {

-				perror("PNG fopen");

+				perror(filename);

 				return 1;

 			}

 			png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);