tpm: replace kmalloc() + memcpy() with kmemdup()

Use kmemdup rather than duplicating its implementation.
Signed-off-by: NJi-Hun Kim <ji_hun.kim@samsung.com>
Reviewed-by: NJames Morris <james.morris@microsoft.com>
Reviewed-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

drivers/char/tpm/eventlog/of.c

@@ -69,14 +69,12 @@ int tpm_read_log_of(struct tpm_chip *chip)
 		return -EIO;
 	}
 
-	log->bios_event_log = kmalloc(size, GFP_KERNEL);
+	log->bios_event_log = kmemdup(__va(base), size, GFP_KERNEL);
 	if (!log->bios_event_log)
 		return -ENOMEM;
 
 	log->bios_event_log_end = log->bios_event_log + size;
 
-	memcpy(log->bios_event_log, __va(base), size);
-
 	if (chip->flags & TPM_CHIP_FLAG_TPM2)
 		return EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
 	return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;