Do not truncate return value of get{,e}[ug]id and setfs[ug]id syscalls

This should not be a user visible change unless the kernel does
something completely unexpected.  In the latter case, let user see
what is going on.

* uid.c (SYS_FUNC(getuid), SYS_FUNC(setfsuid)): Do not truncate
tcp->u_rval to uid_t on exiting syscall, return RVAL_DECODED.

Author: ldv-alt

uid.c

@@ -70,18 +70,15 @@
 
 SYS_FUNC(getuid)
 {
-	if (exiting(tcp))
-		tcp->u_rval = (uid_t) tcp->u_rval;
-	return RVAL_UDECIMAL;
+	return RVAL_UDECIMAL | RVAL_DECODED;
 }
 
 SYS_FUNC(setfsuid)
 {
 	if (entering(tcp))
 		tprintf("%u", (uid_t) tcp->u_arg[0]);
-	else
-		tcp->u_rval = (uid_t) tcp->u_rval;
-	return RVAL_UDECIMAL;
+
+	return RVAL_UDECIMAL | RVAL_DECODED;
 }
 
 SYS_FUNC(setuid)