mesa: Fix array out-of-bounds access by _mesa_Fogf.

_mesa_Fogf calls _mesa_Fogfv, which uses the params argument
as an array.

src/mesa/main/fog.c

@@ -34,7 +34,10 @@
 void GLAPIENTRY
 _mesa_Fogf(GLenum pname, GLfloat param)
 {
-   _mesa_Fogfv(pname, &param);
+   GLfloat fparam[4];
+   fparam[0] = param;
+   fparam[1] = fparam[2] = fparam[3] = 0.0F;
+   _mesa_Fogfv(pname, fparam);
 }