ac/llvm: add missing type convert for nir_load_buffer_amd

Fixes: afcbccb078 ("ac/llvm: implement ACCESS_USE_FORMAT_AMD as buffer_load/store_format")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22043>

src/amd/llvm/ac_nir_to_llvm.c

@@ -4001,6 +4001,7 @@ static bool visit_intrinsic(struct ac_nir_context *ctx, nir_intrinsic_instr *ins
          result = ac_build_buffer_load_format(&ctx->ac, descriptor, vidx, voffset, num_components,
                                               cache_policy, reorder,
                                               instr->dest.ssa.bit_size == 16, false);
+         result = ac_to_integer(&ctx->ac, result);
       } else if (instr->intrinsic == nir_intrinsic_store_buffer_amd && uses_format) {
          assert(instr->src[0].ssa->bit_size == 16 || instr->src[0].ssa->bit_size == 32);
          ac_build_buffer_store_format(&ctx->ac, descriptor, store_data, vidx, voffset, cache_policy);