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Don't ignore the return code of fwrite(). (Slight modification of a
patch from Phil Bordelon.)

[originally from svn r8373]

--- a/obfusc.c

+++ b/obfusc.c

@@ -114,7 +114,11 @@

     obfuscate_bitmap(data, datalen * 8, decode);

     if (outputmode == BINARY) {

-	fwrite(data, 1, datalen, stdout);

+	int ret = fwrite(data, 1, datalen, stdout);

+        if (ret < 0) {

+            fprintf(stderr, "obfusc: write: %s\n", strerror(errno));

+            return 1;

+        }

     } else {

 	int i;

 	for (i = 0; i < datalen; i++)