!2131 (merged) added a R_CheckSpriteVisible function, where I get a warning: 'yscale' may be used uninitialized [-Wmaybe-uninitialized] warning when compiling SRB2. This merge request initialises it to zero to avoid that. (Technically, the warning only occurred with yscale, not texturemid or height (for some reason?), but I decided to zero-initialise all three variables for consistency.)
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TL;DR: Fixed a compiler warning