Merge branch 'rs/config-write-section-fix' into maint

There was a recent semantic mismerge in the codepath to write out a
section of a configuration section, which has been corrected.

* rs/config-write-section-fix:
  config: flip return value of write_section()

config.c

@@ -2315,7 +2315,7 @@ static ssize_t write_section(int fd, const char *key)
 	struct strbuf sb = store_create_section(key);
 	ssize_t ret;
 
-	ret = write_in_full(fd, sb.buf, sb.len) == sb.len;
+	ret = write_in_full(fd, sb.buf, sb.len);
 	strbuf_release(&sb);
 
 	return ret;