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R_AliasClipTriangle: fix dangling stack pointer set in a global variable (clang analyzer)

--- a/r_aclip.c

+++ b/r_aclip.c

@@ -208,9 +208,9 @@

 */

 void R_AliasClipTriangle (mtriangle_t *ptri)

 {

-	int				i, k, pingpong;

-	mtriangle_t		mtri;

-	unsigned		clipflags;

+	int					i, k, pingpong;

+	static mtriangle_t	mtri;

+	unsigned			clipflags;

 	memset(fv, 0, sizeof(fv));