STYLE: check autoPtr as plain bool instead of valid()

- cleaner code, more similarity with unique_ptr

  Now
      if (ptr)
      if (!ptr)

  instead
      if (ptr.valid())
      if (!ptr.valid())

src/parallel/distributed/distributedTriSurfaceMesh/distributedTriSurfaceMesh.C

@@ -1601,7 +1601,7 @@ Foam::distributedTriSurfaceMesh::independentlyDistributedBbs
         "distributedTriSurfaceMesh::independentlyDistributedBbs"
     );
 
-    if (!decomposer_.valid())
+    if (!decomposer_)
     {
         // Use singleton decomposeParDict. Cannot use decompositionModel
         // here since we've only got Time and not a mesh.
@@ -1619,7 +1619,7 @@ Foam::distributedTriSurfaceMesh::independentlyDistributedBbs
         }
         else
         {
-            if (!decomposeParDict_.valid())
+            if (!decomposeParDict_)
             {
                 decomposeParDict_.reset
                 (
@@ -1637,7 +1637,7 @@ Foam::distributedTriSurfaceMesh::independentlyDistributedBbs
                     )
                 );
             }
-            decomposer_ = decompositionMethod::New(decomposeParDict_());
+            decomposer_ = decompositionMethod::New(*decomposeParDict_);
         }
     }
 
@@ -2756,7 +2756,7 @@ void Foam::distributedTriSurfaceMesh::clearOut()
 
 const Foam::globalIndex& Foam::distributedTriSurfaceMesh::globalTris() const
 {
-    if (!globalTris_.valid())
+    if (!globalTris_)
     {
         globalTris_.reset(new globalIndex(triSurface::size()));
     }

src/parallel/distributed/patchDistMethods/exact/exactPatchDistMethod.C

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2018 OpenCFD Ltd.
+    Copyright (C) 2018-2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -46,7 +46,7 @@ namespace patchDistMethods
 const Foam::distributedTriSurfaceMesh&
 Foam::patchDistMethods::exact::patchSurface() const
 {
-    if (!patchSurfPtr_.valid())
+    if (!patchSurfPtr_)
     {
         const polyBoundaryMesh& pbm = mesh_.boundaryMesh();