ripple/minitrace: convert openat dirfd correctly

Our conversion always mangled it, *and* our comparison was inverted,
so both bugs remained hidden.

Change-Id: Ied63822001c8700fc71c89ec16d18036fbc33972

1 files changed, 3 insertions, 1 deletions

diff --git a/ripple/minitrace/src/main.rs b/ripple/minitrace/src/main.rs
index ee09c99..bdf957d 100644
--- a/ripple/minitrace/src/main.rs
+++ b/ripple/minitrace/src/main.rs
@@ -286,7 +286,9 @@ fn check_syscall(process: &Process, entry: SyscallEntry) -> bool {
 		257 => {
 			let [dirfd, pathname, flags, _mode, ..] = entry.args;
 
-			if dirfd.try_into() == Ok(AT_FDCWD) {
+			let dirfd = u32::try_from(dirfd).map(|x| x as i32);
+
+			if dirfd != Ok(AT_FDCWD) {
 				return false;
 			}