bpf, i386: Remove unneeded conversion to bool

The '==' expression itself is bool, no need to convert it to bool again.
This fixes the following coccicheck warning:

  arch/x86/net/bpf_jit_comp32.c:1478:50-55: WARNING: conversion to bool not needed here
  arch/x86/net/bpf_jit_comp32.c:1479:50-55: WARNING: conversion to bool not needed here

Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200506140352.37154-1-yanaijie@huawei.com