V4L/DVB (9887): Minor fixes for cx24113-driver (codingstyle)

Fixed some minor coding style issues and some driver information
printed when using the driver on a board.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/cx24113.c

@@ -557,6 +557,7 @@ struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
 	/* allocate memory for the internal state */
 	struct cx24113_state *state =
 		kzalloc(sizeof(struct cx24113_state), GFP_KERNEL);
+	int rc;
 	if (state == NULL) {
 		err("Unable to kmalloc\n");
 		goto error;
@@ -572,15 +573,22 @@ struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
 	 * after power on */
 	cx24113_readreg(state, 0x00);
 
-	switch (state->rev = cx24113_readreg(state, 0x00)) {
+	rc = cx24113_readreg(state, 0x00);
+	if (rc < 0) {
+		info("cx24113 not found.\n");
+		goto error;
+	}
+	state->rev = rc;
+
+	switch (rc) {
 	case 0x43:
-		info("unknown device\n");
+		info("detected Cx24113 variant\n");
 		break;
 	case REV_CX24113:
-		info("CX24113\n");
+		info("sucessfully detected\n");
 		break;
 	default:
-		err("unsupported revision: %x\n", state->rev);
+		err("unsupported device id: %x\n", state->rev);
 		goto error;
 	}
 	state->ver = cx24113_readreg(state, 0x01);