Use negative_errno() to assert errno is positive after a few system calls

This is not particularly intrusive because it happens in simple
utility functions. It helps gcc understand that error codes
are negative.

This gets a rid of most of the remaining warnings.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/shared/ask-password-api.c b/src/shared/ask-password-api.c
index bc12f89f02..8de1445a96 100644
--- a/src/shared/ask-password-api.c
+++ b/src/shared/ask-password-api.c
@@ -71,7 +71,7 @@ static int lookup_key(const char *keyname, key_serial_t *ret) {
 
         serial = request_key("user", keyname, NULL, 0);
         if (serial == -1)
-                return -errno;
+                return negative_errno();
 
         *ret = serial;
         return 0;