radeonsi/video: Fix assert in radeon_bs_code_ns

It is valid for w to be 1, in that case nothing should be encoded
in the bitstream.
value must be lower than max, add that as an assert instead.

Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35648>

src/gallium/drivers/radeonsi/radeon_bitstream.c

@@ -156,6 +156,8 @@ void radeon_bs_code_ns(struct radeon_bitstream *bs, uint32_t value, uint32_t max
    uint32_t m;
    uint32_t max_num = max;
 
+   assert(value < max);
+
    while ( max_num ) {
       max_num >>= 1;
       w++;
@@ -163,8 +165,6 @@ void radeon_bs_code_ns(struct radeon_bitstream *bs, uint32_t value, uint32_t max
 
    m = (1 << w) - max;
 
-   assert(w > 1);
-
    if (value < m) {
       radeon_bs_code_fixed_bits(bs, value, (w - 1));
    } else {