[PATCH v3] errno.3: Fix ENODATA text

[Alejandro Colomar <alx.manpages@gmail.com>]

ENODATA is an XSI STREAMS extension (not base POSIX).

Linux reused the name for extended attributes.
The current manual pages don't use ENODATA with its POSIX
meaning, so use the xattr(7) specific text, and leave the POSIX
meaning for a secondary paragraph.

Reported-by: Mark Kettenis <kettenis@openbsd.org>
Reported-by: Florian Weimer <fw@deneb.enyo.de>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---
 man3/errno.3 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/man3/errno.3 b/man3/errno.3
index fe9b7f715..eeb885823 100644
--- a/man3/errno.3
+++ b/man3/errno.3
@@ -403,7 +403,13 @@ No buffer space available (POSIX.1 (XSI STREAMS option)).
 .\" ENOCSI is defined but appears to be unused.
 .TP
 .B ENODATA
-No message is available on the STREAM head read queue (POSIX.1-2001).
+The named attribute does not exist,
+or the process has no access to this attribute; see
+.BR xattr (7).
+.IP
+In POSIX.1-2001 (XSI STREAMS option),
+this error was described as
+"No message is available on the STREAM head read queue".
 .TP
 .B ENODEV
 No such device (POSIX.1-2001).
-- 
2.30.1