hurd: Use __hurd_fail () instead of assigning errno

The __hurd_fail () inline function is the dedicated, idiomatic way of
reporting errors in the Hurd part of glibc. Not only is it more concise
than '{ errno = err; return -1; }', it is since commit
6639cc10029e24e06b34e169712b21c31b8cf213
"hurd: Mark error functions as __COLD" marked with the cold attribute,
telling the compiler that this codepath is unlikely to be executed.

In one case, use __hurd_dfail () over the plain __hurd_fail ().

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230520115531.3911877-1-bugaevc@gmail.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/sysdeps/mach/hurd/ttyname_r.c b/sysdeps/mach/hurd/ttyname_r.c
index 35a657bf61..8fd05a8d85 100644
--- a/sysdeps/mach/hurd/ttyname_r.c
+++ b/sysdeps/mach/hurd/ttyname_r.c
@@ -41,10 +41,7 @@ __ttyname_r (int fd, char *buf, size_t buflen)
 
   len = strlen (nodename) + 1;
   if (len > buflen)
-    {
-      errno = ERANGE;
-      return errno;
-    }
+    return __hurd_fail (ERANGE), ERANGE;
 
   memcpy (buf, nodename, len);
   return 0;