idcache.c: syntax-only change

[Jim Meyering]

        Use cleaner syntax: NULL rather than 0.
        * lib/idcache.c (getuidbyname, getgidbyname): Return NULL, not 0.

Index: lib/idcache.c
===================================================================
RCS file: /sources/gnulib/gnulib/lib/idcache.c,v
retrieving revision 1.19
diff -u -r1.19 idcache.c
--- lib/idcache.c       20 Nov 2006 09:10:18 -0000      1.19
+++ lib/idcache.c       20 Nov 2006 09:25:33 -0000
@@ -91,7 +91,7 @@
   for (tail = nouser_alist; tail; tail = tail->next)
     /* Avoid a function call for the most common case.  */
     if (*tail->name == *user && !strcmp (tail->name, user))
-      return 0;
+      return NULL;

   pwent = getpwnam (user);
 #ifdef __DJGPP__
@@ -118,7 +118,7 @@

   tail->next = nouser_alist;
   nouser_alist = tail;
-  return 0;
+  return NULL;
 }

 /* Use the same struct as for userids.  */
@@ -167,7 +167,7 @@
   for (tail = nogroup_alist; tail; tail = tail->next)
     /* Avoid a function call for the most common case.  */
     if (*tail->name == *group && !strcmp (tail->name, group))
-      return 0;
+      return NULL;

   grent = getgrnam (group);
 #ifdef __DJGPP__
@@ -194,5 +194,5 @@

   tail->next = nogroup_alist;
   nogroup_alist = tail;
-  return 0;
+  return NULL;
 }