util: Fix system call name resolution in syscall_name() debug function

Fix the starting index, otherwise we miss the first call in sets
(say, mknod in filesystem calls).

And if we don't find a matching name for the system call, actually
return it, instead of trying to fetch it from the current (invalid)
call.

Fixes: bdbec30a8498 ("seitan: Add netlink, sendto()/sendmsg(), iovec handling, demo with routes")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/common/util.c b/common/util.c
index 3164126..f0a1df4 100644
--- a/common/util.c
+++ b/common/util.c
@@ -68,14 +68,16 @@ const char *syscall_name(long nr) {
 		if (!call->name) {
 			set++;
 			call = set[0];
-			continue;
+
+			if (!*set)
+				return "unknown";
 		}
 
 		if (nr == call->number)
 			break;
 	}
 
-	return call ? call->name : "unknown";
+	return call->name;
 }
 
 const char *syscall_name_str[N_SYSCALL + 1] = {