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.sakkine@linux.intel.com>
Signed-off-by: NJarkko Sakkinen <jarkko.sakkine@linux.intel.com>

drivers/char/tpm/eventlog/efi.c

@@ -51,10 +51,9 @@ int tpm_read_log_efi(struct tpm_chip *chip)
 	}
 
 	/* malloc EventLog space */
-	log->bios_event_log = kmalloc(log_size, GFP_KERNEL);
+	log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
 	if (!log->bios_event_log)
 		goto err_memunmap;
-	memcpy(log->bios_event_log, log_tbl->log, log_size);
 	log->bios_event_log_end = log->bios_event_log + log_size;
 
 	tpm_log_version = log_tbl->version;