Fixes compile error.

Author: kdschlosser

ext_mod/lcd_bus/esp32_src/rgb_bus_rotation.c

@@ -384,11 +384,10 @@
             uint32_t dst_bytes_per_line = dst_width * bytes_per_pixel;
 
             if (rgb565_dither) {
-                uint32_t tmp_x;
                 for(uint32_t y = y_start; y < y_end; y++) {
                     for (uint32_t x=0;x<x_end;x++) {
                         rgb565_dither_pixel(CALC_THRESHOLD(x, y), (uint16_t *)(src) + x);
-                        copy_16bpp((uint16_t *)(src) + x, (uint16_t *)(to) + x);
+                        copy_16bpp((uint16_t *)(src) + x, (uint16_t *)(dst) + x);
                     }
                     dst += dst_bytes_per_line;
                     src += src_bytes_per_line;