files: don't leak a file descriptor on an error path

CID 84652 (#1 of 1): Resource leak (RESOURCE_LEAK)
6. leaked_handle: Handle variable newfd going out of scope leaks the handle.

files.c

@@ -1526,6 +1526,7 @@ int inherit_fd_resolve_clash(int fd)
 	}
 
 	if (close(fd) == -1) {
+		close(newfd);
 		pr_perror("Can't close inherit fd %d", fd);
 		return -1;
 	}