x86/mce/dev-mcelog: use strscpy() to instead of strncpy()

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL terminated strings.

Signed-off-by: Xu Panda <[email protected]>
Signed-off-by: Yang Yang <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Xu Panda

arch/x86/kernel/cpu/mce/dev-mcelog.c

@@ -105,8 +105,7 @@ static ssize_t set_trigger(struct device *s, struct device_attribute *attr,
 {
 	char *p;
 
-	strncpy(mce_helper, buf, sizeof(mce_helper));
-	mce_helper[sizeof(mce_helper)-1] = 0;
+	strscpy(mce_helper, buf, sizeof(mce_helper));
 	p = strchr(mce_helper, '\n');
 
 	if (p)