can: janz-ican3: fix uninitialized variable warnings

Analysis of the code shows that the struct ican3_msg variable cannot be
used uninitialized. Error conditions are checked and the loop terminates
before calling the ican3_handle_message() function with an uninitialized
value.
Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/janz-ican3.c

@@ -1322,7 +1322,7 @@ static int ican3_napi(struct napi_struct *napi, int budget)
 
 	/* process all communication messages */
 	while (true) {
-		struct ican3_msg msg;
+		struct ican3_msg uninitialized_var(msg);
 		ret = ican3_recv_msg(mod, &msg);
 		if (ret)
 			break;