r200: Fix EXT_fogcoord rendering.

The fogcoord calue was not pushed to GPU because of implicit float to int conversion.
Fix is to use float pointer to buffer object so no conversion is done in assigment

src/mesa/drivers/dri/r200/r200_maos_arrays.c

@@ -74,7 +74,7 @@ static void r200_emit_vecfog(GLcontext *ctx, struct radeon_aos *aos,
 			     GLvoid *data, int stride, int count)
 {
 	radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
-	uint32_t *out;
+	GLfloat *out;
 	int i;
 	int size = 1;
 
@@ -91,7 +91,7 @@ static void r200_emit_vecfog(GLcontext *ctx, struct radeon_aos *aos,
 	aos->count = count;
 
 	radeon_bo_map(aos->bo, 1);
-	out = (uint32_t*)((char*)aos->bo->ptr + aos->offset);
+	out = (GLfloat*)((char*)aos->bo->ptr + aos->offset);
 	for (i = 0; i < count; i++) {
 	  out[0] = r200ComputeFogBlendFactor( ctx, *(GLfloat *)data );
 	  out++;