radv: Fix asserts using assign instead of compare.

Fix defects reported by Coverity Scan.

Assign instead of compare (PW.ASSIGN_WHERE_COMPARE_MEANT) assign_where_compare_meant: use of "=" where "==" may have been intended

Fixes: d8cdcd4a ("radv: use syncobj for wsi fence") Signed-off-by: Vinson Lee vlee@freedesktop.org

cc: @flto