Added unbind texture to samples and tests

samples/2_Cookbook/11_texture_driver/texture2dDrv.cpp

@@ -124,6 +124,7 @@ bool runTest(int argc, char** argv) {
             }
         }
     }
+    hipUnbindTexture(tex);
     hipFree(dData);
     hipFreeArray(array);
     return true;

tests/src/texture/hipTextureRef2D.cpp

@@ -90,6 +90,7 @@ int runTest(int argc, char** argv) {
             }
         }
     }
+    HIPCHECK(hipUnbindTexture(tex));
     hipFree(dData);
     hipFreeArray(hipArray);
     return testResult;