rtc: s35390a: Change buf's type to u8 in s35390a_init

BugLink: https://bugs.launchpad.net/bugs/1854855

[ Upstream commit ef0f02fd ]

Clang warns:

drivers/rtc/rtc-s35390a.c:124:27: warning: implicit conversion from
'int' to 'char' changes value from 192 to -64 [-Wconstant-conversion]
        buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
            ~ ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
1 warning generated.

Update buf to be an unsigned 8-bit integer, which matches the buf member
in struct i2c_msg.

https://github.com/ClangBuiltLinux/linux/issues/145Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/rtc/rtc-s35390a.c

@@ -106,7 +106,7 @@ static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
  */
 static int s35390a_reset(struct s35390a *s35390a, char *status1)
 {
-	char buf;
+	u8 buf;
 	int ret;
 	unsigned initcount = 0;