Ensure that getpwent() is used in setpwent(), getpwent(),

endpwend() sequences (ditto for getgrent(), getspent(), and
getsgent()). The only real (minor) issue was in login, which kept
the passwd file open.
* libmisc/entry.c: Remove unneeded setspent() and endspent() (only
  getspnam is called in the middle).
* libmisc/find_new_ids.c: Make sure to close the password and
  group files with endpwent() and endgrent().
* libmisc/pwdcheck.c: Remove unneeded endspent() (only getspnam()
  is called before).
* src/lastlog.c, src/passwd.c, src/groupmod.c, src/faillog.c,
  src/groups.c: Make sure to close
  the password file with endpwent().
* src/login.c: Remove unneeded setpwent() (only xgetpwnam is
  called before).
* src/login.c, src/newgrp.c: Fix typos in comments.

src/faillog.c

@@ -170,6 +170,7 @@ static void reset (void)
 		while ( (pwent = getpwent ()) != NULL ) {
 			reset_one (pwent->pw_uid);
 		}
+		endpwent ();
 	}
 }
 
@@ -246,8 +247,10 @@ static void setmax (int max)
 		setmax_one (user, max);
 	} else {
 		setpwent ();
-		while ((pwent = getpwent ()))
+		while ( (pwent = getpwent ()) != NULL ) {
 			setmax_one (pwent->pw_uid, max);
+		}
+		endpwent ();
 	}
 }
 
@@ -288,8 +291,10 @@ static void set_locktime (long locktime)
 		set_locktime_one (user, locktime);
 	} else {
 		setpwent ();
-		while ((pwent = getpwent ()))
+		while ( (pwent = getpwent ()) != NULL ) {
 			set_locktime_one (pwent->pw_uid, locktime);
+		}
+		endpwent ();
 	}
 }