crypto: ccp - Fix static checker warning

Under certain configuration SEV functions can be defined as no-op.
In such a case error can be uninitialized.

Initialize the variable to 0.

Cc: Dan Carpenter <Dan.Carpenter@oracle.com>
Reported-by: Dan Carpenter <Dan.Carpenter@oracle.com>
Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccp/psp-dev.c

@@ -423,7 +423,7 @@ EXPORT_SYMBOL_GPL(psp_copy_user_blob);
 static int sev_get_api_version(void)
 {
 	struct sev_user_data_status *status;
-	int error, ret;
+	int error = 0, ret;
 
 	status = &psp_master->status_cmd_buf;
 	ret = sev_platform_status(status, &error);