Small bugfix for non-dev PETSc version.

AMDiS/src/parallel/PetscSolverGlobalMatrix.cc

@@ -186,11 +186,11 @@ namespace AMDiS {
     VecDestroy(&petscTmpVec);
     KSPDestroy(&solver);
 #else
-    MatDestroy(&petscMatrix);
-    VecDestroy(&petscRhsVec);
-    VecDestroy(&petscSolVec);
-    VecDestroy(&petscTmpVec);
-    KSPDestroy(&solver);
+    MatDestroy(petscMatrix);
+    VecDestroy(petscRhsVec);
+    VecDestroy(petscSolVec);
+    VecDestroy(petscTmpVec);
+    KSPDestroy(solver);
 #endif
   }