Fix hipHostRegister mem leak and copy kind in hipMemcpyAsync (#587)

tests/src/runtimeApi/memory/hipMemcpyAsync.cpp

@@ -41,7 +41,7 @@ void simpleNegTest() {
 
 
     // Not sure what happens here, the memory must be pinned.
-    e = hipMemcpyAsync(A_malloc, A_d, Nbytes, hipMemcpyHostToDevice, NULL);
+    e = hipMemcpyAsync(A_malloc, A_d, Nbytes, hipMemcpyDeviceToHost, NULL);
 
     printf("  async memcpy of A_malloc to A_d. Result=%d\n", e);
     // HIPASSERT (e==hipErrorInvalidValue);