Fix OpenCL version of HoughLinesP function

modules/imgproc/src/opencl/hough_lines.cl

@@ -184,6 +184,8 @@ __kernel void get_lines(__global const uchar * accum_ptr, int accum_step, int ac
     int x = get_global_id(0);
     int y = get_global_id(1);
 
+    if (y < accum_rows-2)
+    {
         __global uchar* accum = accum_ptr + mad24(y+1, accum_step, mad24(x+1, (int) sizeof(int), accum_offset));
         __global int4* lines = (__global int4*)(lines_ptr + lines_offset);
         __global int* lines_index = lines_index_ptr + 1;
@@ -325,6 +327,7 @@ __kernel void get_lines(__global const uchar * accum_ptr, int accum_step, int ac
             }
 
         }
+    }
 }
 
 #endif