LVGL Compile issue with MSVC toolchain

[MouriNaruto]

I found an issue when I update the LVGL git submodule for the LVGL for Visual Studio project.

lvgl/src/widgets/roller/lv_roller.c

Line 184 in 9c437d1

if((uint32_t)LV_ABS((int16_t)act_opt - sel_opt) > real_option_cnt / 2) {

(uint32_t)LV_ABS((int16_t)act_opt - sel_opt) should be changed to (uint32_t)LV_ABS((int16_t)(act_opt - sel_opt)), or you will meet the compilation "error C4146: unary minus operator applied to unsigned type, result still unsigned" when you compiling LVGL with MSVC toolchain.

Kenji Mouri

[kisvegabor]

Fixed, thank you!