[PATCH] fix ide-lib.c warning when compiling IDE without DMA support

From Mikael Pettersson <mikpe@csd.uu.se>.

drivers/ide/ide-lib.c

@@ -170,7 +170,7 @@ u8 ide_rate_filter (u8 mode, u8 speed)
 		BUG();
 	return min(speed, speed_max[mode]);
 #else /* !CONFIG_BLK_DEV_IDEDMA */
-	return min(speed, XFER_PIO_4);
+	return min(speed, (u8)XFER_PIO_4);
 #endif /* CONFIG_BLK_DEV_IDEDMA */
 }