cutils: tighten qemu_parse_fd()
qemu_parse_fd() used to handle at least the following strings incorrectly: o "-2": simply let through o "2147483648": returned as LONG_MAX==INT_MAX on ILP32 (with ERANGE ignored); implementation-defined behavior on LP64 Signed-off-by: NLaszlo Ersek <lersek@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
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