radv: Use correct buffer size for query pool result copies.
1. the dst stride may be too small if count=1. 2. the src stride may be too small due to the availability bit. So lets just compute the size needed explicitly and use it. Fixes: 90a0556c ("radv: use pool stride when copying single query results") Reviewed-by:Samuel Pitoiset <samuel.pitoiset@gmail.com> Part-of: <mesa/mesa!14242>