tpm: Fix the type of the return value in calc_tpm2_event_size()

commit b9d0a85d6b2e76630cfd4c475ee3af4109bfd87a upstream

calc_tpm2_event_size() has an invalid signature because
it returns a 'size_t' where as its signature says that
it returns 'int'.

Cc: <stable@vger.kernel.org>
Fixes: 4d23cc32 ("tpm: add securityfs support for TPM 2.0 firmware event log")
Suggested-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: NYue Haibing <yuehaibing@huawei.com>
Reviewed-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: NJames Morris <james.morris@microsoft.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>

drivers/char/tpm/eventlog/tpm2.c

@@ -37,8 +37,8 @@
  *
  * Returns size of the event. If it is an invalid event, returns 0.
  */
-static int calc_tpm2_event_size(struct tcg_pcr_event2 *event,
-				struct tcg_pcr_event *event_header)
+static size_t calc_tpm2_event_size(struct tcg_pcr_event2 *event,
+				   struct tcg_pcr_event *event_header)
 {
 	struct tcg_efi_specid_event *efispecid;
 	struct tcg_event_field *event_field;