media: ir-kbd-i2c: improve error handling code

The current I2C error handling logic makes static analyzers
confused, and it doesn't follow the coding style we're using:

	drivers/media/i2c/ir-kbd-i2c.c:180 get_key_pixelview() error: uninitialized symbol 'b'.
	drivers/media/i2c/ir-kbd-i2c.c:224 get_key_knc1() error: uninitialized symbol 'b'.
	drivers/media/i2c/ir-kbd-i2c.c:226 get_key_knc1() error: uninitialized symbol 'b'.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ir-kbd-i2c.c

@@ -168,11 +168,15 @@ static int get_key_haup_xvr(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_pixelview(struct IR_i2c *ir, enum rc_proto *protocol,
 			     u32 *scancode, u8 *toggle)
 {
+	int rc;
 	unsigned char b;
 
 	/* poll IR chip */
-	if (1 != i2c_master_recv(ir->c, &b, 1)) {
+	rc = i2c_master_recv(ir->c, &b, 1);
+	if (rc != 1) {
 		dev_dbg(&ir->rc->dev, "read error\n");
+		if (rc < 0)
+			return rc;
 		return -EIO;
 	}
 
@@ -185,11 +189,15 @@ static int get_key_pixelview(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_fusionhdtv(struct IR_i2c *ir, enum rc_proto *protocol,
 			      u32 *scancode, u8 *toggle)
 {
+	int rc;
 	unsigned char buf[4];
 
 	/* poll IR chip */
-	if (4 != i2c_master_recv(ir->c, buf, 4)) {
+	rc = i2c_master_recv(ir->c, buf, 4);
+	if (rc != 4) {
 		dev_dbg(&ir->rc->dev, "read error\n");
+		if (rc < 0)
+			return rc;
 		return -EIO;
 	}
 
@@ -209,11 +217,15 @@ static int get_key_fusionhdtv(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_knc1(struct IR_i2c *ir, enum rc_proto *protocol,
 			u32 *scancode, u8 *toggle)
 {
+	int rc;
 	unsigned char b;
 
 	/* poll IR chip */
-	if (1 != i2c_master_recv(ir->c, &b, 1)) {
+	rc = i2c_master_recv(ir->c, &b, 1);
+	if (rc != 1) {
 		dev_dbg(&ir->rc->dev, "read error\n");
+		if (rc < 0)
+			return rc;
 		return -EIO;
 	}