libselinux/utils: use correct error handling

Instead of returning directly goto the err label, which prints a message
and closes the opened file stream.

Found by clang-analyzer.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

libselinux/utils/sefcontext_compile.c

@@ -471,7 +471,7 @@ static int write_binary_file(const struct saved_data *data, const struct sidtab
 	/* write context table */
 	rc = write_sidtab(bin_file, stab);
 	if (rc)
-		return rc;
+		goto err;
 
 	rc = write_spec_node(bin_file, do_write_precompregex, data->root, stab);
 	if (rc)