Mountpoint does not have to exist on macOS

macFUSE will create the mounpoint (in case it does not exist) before
mounting the volume. This allows unprivileged users to mount volumes
under /Volumes.

sshfs.c

@@ -3798,6 +3798,16 @@ static int sshfs_opt_proc(void *data, const char *arg, int key,
 				sshfs.mountpoint = strdup(arg);
 			} else {
 				sshfs.mountpoint = realpath(arg, NULL);
+#ifdef __APPLE__
+				if (!sshfs.mountpoint) {
+					/*
+					 * The mountpoint does not exist, yet.
+					 * macFUSE will try to create it before
+					 * mounting the volume.
+					 */
+					sshfs.mountpoint = strdup(arg);
+				}
+#endif
 			}
 #endif
 			if (!sshfs.mountpoint) {