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drm_hwcomposer: fix sign-compare building error in uevent listener

maurossi requested to merge issor.oruam/drm-hwcomposer:uevent_listener_fix into main 
d26619b5 ("drm_hwcomposer: CI: Upgrade clang-* to v12") declared 'ret' as ssize_t
but after commit 1e053b4e ("drm_hwcomposer: Make uevent listener standalone")
drm/UEventListener.cpp is affected by the following builing error:

external/drm_hwcomposer/drm/UEventListener.cpp:82:28:
error: comparison of integers of different signs: 'uint32_t' (aka 'unsigned int') and 'ssize_t' (aka 'int') [-Werror,-Wsign-compare]
    for (uint32_t i = 0; i < ret;) {
                         ~ ^ ~~~
1 error generated.

Fixes: 1e053b4e ("drm_hwcomposer: Make uevent listener standalone")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>

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