serial: stm32: Fix comparisons with undefined register

drivers/tty/serial/stm32-usart.c: In function ‘stm32_receive_chars’:
    drivers/tty/serial/stm32-usart.c:130: warning: comparison is always true due to limited range of data type
    drivers/tty/serial/stm32-usart.c: In function ‘stm32_tx_dma_complete’:
    drivers/tty/serial/stm32-usart.c:177: warning: comparison is always false due to limited range of data type

stm32_usart_offsets.icr is u8, while UNDEF_REG = ~0 is int, and thus
0xffffffff.

As all registers in stm32_usart_offsets are u8, change the definition of
UNDEF_REG to 0xff to fix this.

Fixes: ada8618ff3 ("serial: stm32: adding support for stm32f7")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/stm32-usart.h

@@ -31,7 +31,7 @@ struct stm32_usart_info {
 	struct stm32_usart_config cfg;
 };
 
-#define UNDEF_REG ~0
+#define UNDEF_REG 0xff
 
 /* Register offsets */
 struct stm32_usart_info stm32f4_info = {