mfd: aat2870: Use scnprintf() for avoiding potential buffer overflow

There is still one call of sprintf() without checking the proper
buffer overflow in aat2870_dump_reg(). Replace it with scnprintf()
call for covering that.

Signed-off-by: Takashi Iwai <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/aat2870-core.c

···
 
 	count += sprintf(buf, "aat2870 registers\n");
 	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
-		count += sprintf(buf + count, "0x%02x: ", addr);
+		count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
 		if (count >= PAGE_SIZE - 1)
 			break;