* [rcore] fix crash in InitWindow, due to unchecked result of InitPlatform
Check the result of InitPlatform(), if it isn't 0, report the Error
and return. This prevent crashes and allows for gracefully aborting
or recovering by checking IsWindowReady().
Partially-fixes: https://github.com/raysan5/raylib/issues/4801
* [rcore] style: store the result of InitPlatform() before checking it
Small style change that doesn't impact how the code behaves here.
Variable 'result' is not used anywhere else in this block,
it's just for compliance with Raylib's coding conventions.
Requested in PR: https://github.com/raysan5/raylib/pull/4803#discussion_r1976502788
* [rcore] use LOG_WARNING when InitPlatform() fails
...as this is preferred over LOG_ERROR.
Requested-by: https://github.com/raysan5/raylib/pull/4803#discussion_r1976651724
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