shadow: Fix parsing of gshadow entries

Upstream-Status: Backport [http://anonscm.debian.org/viewvc/pkg-shadow?view=revision&revision=3096]

newgrp command does not function properly.
Even with the valid password, it outputs: "'Invalid password'"

Signed-off-by: Roy.Li <rongqing.li@windriver.com>

2010-02-14  Michael Bunk  <mb@computer-leipzig.com>

	* NEWS, lib/gshadow.c: Fix parsing of gshadow entries.

diff -urpN a/lib/gshadow.c b/lib/gshadow.c
--- a/lib/gshadow.c	2013-07-11 10:18:15.745450428 +0800
+++ b/lib/gshadow.c	2013-07-11 10:17:30.465450280 +0800
@@ -222,6 +222,7 @@ void endsgent (void)
 		if (NULL == buf) {
 			return NULL;
 		}
+		buflen = BUFSIZ;
 	}
 
 	if (NULL == fp) {
@@ -229,9 +230,9 @@ void endsgent (void)
 	}
 
 #ifdef	USE_NIS
-	while (fgetsx (buf, (int) sizeof buf, fp) == buf)
+	while (fgetsx (buf, (int) buflen, fp) == buf)
 #else
-	if (fgetsx (buf, (int) sizeof buf, fp) == buf)
+	if (fgetsx (buf, (int) buflen, fp) == buf)
 #endif
 	{
 		while (   ((cp = strrchr (buf, '\n')) == NULL)