Revert odd clang-tidy 'fix'

Author: gnawme

apps/src/convolve.cpp

@@ -73,8 +73,8 @@ main(int argc, char** argv)
   Eigen::ArrayXf gaussian_kernel(5);
   gaussian_kernel << 1.f / 16, 1.f / 4, 3.f / 8, 1.f / 4, 1.f / 16;
   pcl::console::print_info("convolution kernel:");
-  for (float i : gaussian_kernel)
-    pcl::console::print_info(" %f", i);
+  for (Eigen::Index i = 0; i < gaussian_kernel.size(); ++i)
+    pcl::console::print_info(" %f", gaussian_kernel[i]);
   pcl::console::print_info("\n");
 
   if (argc < 3) {