Fix a "maybe-uninitialized" compiler warning

!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

changed target branch from next to master

added 132 commits

• 4f6da8dc...ae783f01 - 131 commits from branch STJr:master
• 1590f2a6 - Merge branch 'master' into fix-sprite-clip-warning

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approved this merge request

mentioned in commit 0309535b

merged