Make memstv assertions even more precise

src/fellow_storage.c

@@ -74,6 +74,7 @@ static void
 stvfe_oc_dle_submit(struct fellow_fd *ffd, struct objcore *oc,
     enum dle_type type);
 static inline int stvfe_oc_inlog(struct objcore *oc);
+static const struct stevedore sfeexp_stevedore;
 
 /* Compat ------------------------------------------------------------
  */
@@ -241,6 +242,7 @@ stv_stvfe(const struct stevedore *stv)
 #define assert_memstv(stvfe, stv) do {		\
 	assert(stv != NULL);			\
 	assert(stv != stvfe->dskstv);		\
+	assert(stv != &sfeexp_stevedore);	\
 	assert(stv == stvfe->memstv);		\
 	} while (0)