libutil/recurse: Simplify adding trailing slash

We know that r->pathlen < sizeof(r->path) since r->path is
nul-terminated, so we can safely add a '/' here. If there is no
space left over for the rest of the path and nul-terminator, this
will be caught by the subsequent estrlcpy.

libutil/recurse.c

@@ -70,7 +70,7 @@ recurse(int dirfd, const char *name, void *data, struct recursor *r)
 			return;
 		}
 		if (r->path[pathlen - 1] != '/')
-			pathlen += estrlcpy(r->path + pathlen, "/", sizeof(r->path) - pathlen);
+			r->path[pathlen++] = '/';
 		if (r->follow == 'H')
 			flags |= AT_SYMLINK_NOFOLLOW;
 		while ((d = readdir(dp))) {