sock: Correct error checking condition for (assign|release)_proto_idx()(assign|release)_proto_idx() wrongly check find_first_zero_bit() failureby condition '(prot->inuse_idx == PROTO_INUSE_NR - 1)' obviously.Fix by correcting the condition to '(prot->inuse_idx == PROTO_INUSE_NR)'Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>Link: https://patch.msgid.link/20250410-fix_net-v2-1-d69e7c5739a4@quicinc.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>