Fix this warning:

src/av/video/frame.c: In function ‘__pyx_f_2av_5video_5frame_copy_bytes_to_plane’:
src/av/video/frame.c:18808:41: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
18808 |         for (__pyx_t_15 = 0; __pyx_t_15 < __pyx_t_16; __pyx_t_15+=1) {
      |

Author: WyattBlue

av/video/frame.py

@@ -155,7 +155,6 @@ def copy_bytes_to_plane(
         end_row = plane.height
         step = 1
 
-    i, j = cython.declare(cython.int)
     for row in range(start_row, end_row, step):
         i_pos = row * i_stride
         if flip_horizontal: