Don't leak file descriptors.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39383 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/bin/addattr/addAttr.cpp

@@ -144,6 +144,8 @@ addAttr(const char *file, type_code type, const char *name,
 	fs_remove_attr(fd, name);
 	ssize_t bytes = writeAttr(fd, type, name, value, length);
 
+	close(fd);
+
 	return bytes >= 0 ? B_OK : bytes;
 }