Minor fixes

Fixed integer vs unsigned integer comparison in .cpp test source and
trailing whitespaces in source code

modules/optim/src/denoise_tvl1.cpp

@@ -7,7 +7,7 @@
 #define ABSCLIP(val,threshold) MIN(MAX((val),-(threshold)),(threshold))
 
 namespace cv{namespace optim{
-    
+
     class AddFloatToCharScaled{
         public:
             AddFloatToCharScaled(float scale):_scale(scale){}
@@ -91,7 +91,7 @@ namespace cv{namespace optim{
                 float x_new = x_curr[x] + tau*(p_curr[x].y - p_prev[x].y)-tau*s;
                     // X = X2 + theta*(X2 - X)
                 x_curr[x] = x_new + theta*(x_new - x_curr[x]);
-           
+
 
                 for(x = 1; x < cols; x++ )
                 {

modules/optim/test/test_denoise_tvl1.cpp

@@ -41,7 +41,7 @@ TEST(Optim_denoise_tvl1, regression_basic){
 
     const int obs_num=5;
     std::vector<cv::Mat> images(obs_num,cv::Mat());
-    for(int i=0;i<images.size();i++){
+    for(int i=0;i<(int)images.size();i++){
         make_noisy(img,images[i], 20, 0.02,rng);
         //make_spotty(images[i],rng);
     }