remove some useless casts in dynamic linker

src/ldso/dynlink.c

@@ -695,9 +695,9 @@ static void decode_dyn(struct dso *p)
 	if (dyn[0]&(1<<DT_HASH))
 		p->hashtab = laddr(p, dyn[DT_HASH]);
 	if (dyn[0]&(1<<DT_RPATH))
-		p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]);
+		p->rpath_orig = p->strings + dyn[DT_RPATH];
 	if (dyn[0]&(1<<DT_RUNPATH))
-		p->rpath_orig = (void *)(p->strings + dyn[DT_RUNPATH]);
+		p->rpath_orig = p->strings + dyn[DT_RUNPATH];
 	if (search_vec(p->dynv, dyn, DT_GNU_HASH))
 		p->ghashtab = laddr(p, *dyn);
 	if (search_vec(p->dynv, dyn, DT_VERSYM))