Improve test check and fix typo in type check

Author: antonwolfy

dpnp/memory/_memory.py

@@ -95,7 +95,7 @@ def create_data(x):
         )
     usm_data = x.usm_data
 
-    if isinstance(usm_data, tuple(dispatch.keys())):
+    if isinstance(usm_data, tuple(dispatch.values())):
         return usm_data
 
     cls = dispatch.get(type(usm_data), None)

dpnp/tests/test_memory.py

@@ -30,4 +30,4 @@ def test_wrong_usm_data(self):
     def test_ndarray_from_data(self):
         a = dpnp.empty(5)
         b = dpnp.ndarray(a.shape, buffer=a.data)
-        assert b.data is a.data
+        assert b.data.ptr == a.data.ptr