[hackers] [farbfeld] Clean up png2ff, remove debug leftovers || FRIGN

[git]

commit 3ddd2265c4de0ce0b9d9dc7a80dd85aab054d2ae
Author:     FRIGN <d...@frign.de>
AuthorDate: Mon Jan 4 18:29:44 2016 +0100
Commit:     FRIGN <d...@frign.de>
CommitDate: Mon Jan 4 18:29:44 2016 +0100

    Clean up png2ff, remove debug leftovers
    
    Thanks Dimitris, Hiltjo!

diff --git a/png2ff.c b/png2ff.c
index 9f77344..5b75dfa 100644
--- a/png2ff.c
+++ b/png2ff.c
@@ -18,7 +18,7 @@ main(int argc, char *argv[])
        uint16_t tmp16;
 
        if (argc > 1) {
-               fprintf(stderr, "usage:%s\n", argv[0]);
+               fprintf(stderr, "usage: %s\n", argv[0]);
                return 1;
        }
 
@@ -27,10 +27,12 @@ main(int argc, char *argv[])
                                              NULL, NULL);
        png_info_p = png_create_info_struct(png_struct_p);
 
-       if (!png_struct_p || !png_info_p || setjmp(png_jmpbuf(png_struct_p))) {
+       if (!png_struct_p || !png_info_p) {
                fprintf(stderr, "failed to initialize libpng\n");
                return 1;
        }
+       if (setjmp(png_jmpbuf(png_struct_p)))
+               return 1;
        png_init_io(png_struct_p, stdin);
        if (png_get_valid(png_struct_p, png_info_p, PNG_INFO_tRNS))
                png_set_tRNS_to_alpha(png_struct_p);
@@ -69,7 +71,6 @@ main(int argc, char *argv[])
                                fwrite(&tmp16, sizeof(uint16_t), 1, stdout);
                        }
                }
-               fprintf(stderr, "written r=%d, i=%d\n", r, i);
        } else {
                fprintf(stderr, "format error\n");
                return 1;