Remove unused variable in array.c

vshared is no longer used.

array.c

@@ -1043,26 +1043,25 @@ ary_make_shared(VALUE ary)
 	long capa = ARY_CAPA(ary), len = RARRAY_LEN(ary);
         const VALUE *ptr;
         VALUE shared = ary_alloc_heap(0);
-        VALUE vshared = (VALUE)shared;
 
         rb_ary_transient_heap_evacuate(ary, TRUE);
         ptr = ARY_HEAP_PTR(ary);
 
-        FL_UNSET_EMBED(vshared);
-        ARY_SET_LEN(vshared, capa);
-        ARY_SET_PTR(vshared, ptr);
-        ary_mem_clear(vshared, len, capa - len);
-        FL_SET_SHARED_ROOT(vshared);
-        ARY_SET_SHARED_ROOT_REFCNT(vshared, 1);
-	FL_SET_SHARED(ary);
+        FL_UNSET_EMBED(shared);
+        ARY_SET_LEN(shared, capa);
+        ARY_SET_PTR(shared, ptr);
+        ary_mem_clear(shared, len, capa - len);
+        FL_SET_SHARED_ROOT(shared);
+        ARY_SET_SHARED_ROOT_REFCNT(shared, 1);
+        FL_SET_SHARED(ary);
         RB_DEBUG_COUNTER_INC(obj_ary_shared_create);
-        ARY_SET_SHARED(ary, vshared);
-        OBJ_FREEZE(vshared);
+        ARY_SET_SHARED(ary, shared);
+        OBJ_FREEZE(shared);
 
-        ary_verify(vshared);
+        ary_verify(shared);
         ary_verify(ary);
 
-        return vshared;
+        return shared;
     }
 }