fix clobbering of errno in get(pw|gr)([ug]id|nam) by fclose

src/passwd/getgrent.c

@@ -23,17 +23,23 @@ struct group *getgrent()
 struct group *getgrgid(gid_t gid)
 {
 	struct group *gr;
+	int errno_saved;
 	setgrent();
 	while ((gr=getgrent()) && gr->gr_gid != gid);
+	errno_saved = errno;
 	endgrent();
+	errno = errno_saved;
 	return gr;
 }
 
 struct group *getgrnam(const char *name)
 {
 	struct group *gr;
+	int errno_saved;
 	setgrent();
 	while ((gr=getgrent()) && strcmp(gr->gr_name, name));
+	errno_saved = errno;
 	endgrent();
+	errno = errno_saved;
 	return gr;
 }

src/passwd/getpwent.c

@@ -23,17 +23,23 @@ struct passwd *getpwent()
 struct passwd *getpwuid(uid_t uid)
 {
 	struct passwd *pw;
+	int errno_saved;
 	setpwent();
 	while ((pw=getpwent()) && pw->pw_uid != uid);
+	errno_saved = errno;
 	endpwent();
+	errno = errno_saved;
 	return pw;
 }
 
 struct passwd *getpwnam(const char *name)
 {
 	struct passwd *pw;
+	int errno_saved;
 	setpwent();
 	while ((pw=getpwent()) && strcmp(pw->pw_name, name));
+	errno_saved = errno;
 	endpwent();
+	errno = errno_saved;
 	return pw;
 }