fix thrust mr validate alignment condition

Author: davebayer

thrust/thrust/mr/pool_options.h

@@ -99,7 +99,7 @@ struct pool_options
     {
       return false;
     }
-    if (::cuda::__is_valid_alignment(alignment))
+    if (!::cuda::__is_valid_alignment(alignment))
     {
       return false;
     }