tools/firewire: nosy-dump: guard close(fd) when reading from input file

The file descriptor fd is initialized to -1 and only opened via open()
when the --input option is not used. However, close(fd) is called
unconditionally at the end of main(), which results in close(-1) and
a spurious EBADF error when nosy-dump reads from an input file.

Guard the close() call with "if (fd >= 0)" to match the existing
conditional cleanup pattern used for the output file handle.

Signed-off-by: longlong yan <yanlonglong@kylinos.cn>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

tools/firewire/nosy-dump.c

@@ -1014,7 +1014,8 @@ int main(int argc, const char *argv[])
 	if (output != NULL)
 		fclose(output);
 
-	close(fd);
+	if (fd >= 0)
+		close(fd);
 
 	poptFreeContext(con);