Don't forget to reset _pw_stepping_yp to 0 before returning. Fixes a bug

where getpwent() would ignore wildcard entries that followed a netgroup
entry.

PR:		misc/12999
Submitted by:	David Hedley <david@inty.net>

lib/libc/gen/getpwent.c

@@ -427,6 +427,7 @@ unwind(grp)
 				} else {
 					endgrent();
 					latch = 0;
+					_pw_stepping_yp = 0;
 					gr = NULL;
 					return(0);
 				}