[media] easycap: fix warnings: variable set but not used

Signed-off-by: Tomas Winkler <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/staging/media/easycap/easycap_low.c

···
 /****************************************************************************/
 int setup_saa(struct usb_device *p, bool ntsc)
 {
-	int i, ir;
+	int i, rc;
 	const struct saa7113config *cfg;
 	if (!p)
 		return -ENODEV;
 	cfg = (ntsc) ?  saa7113configNTSC : saa7113configPAL;
-	for (i = 0; cfg[i].reg != 0xFF; i++)
-		ir = write_saa(p, cfg[i].reg, cfg[i].set);
+	for (i = 0; cfg[i].reg != 0xFF; i++) {
+		rc = write_saa(p, cfg[i].reg, cfg[i].set);
+		if (rc)
+			dev_err(&p->dev,
+				"Failed to set SAA register %d", cfg[i].reg);
+	}
 	return 0;
 }
 /****************************************************************************/

drivers/staging/media/easycap/easycap_main.c

···
  *  WHEN BOOLEAN PARAMETER decimatepixel IS true, ONLY THE FIELD FOR WHICH
  *  odd==false IS TRANSFERRED TO THE FRAME BUFFER.
  *
- *  THE BOOLEAN PARAMETER offerfields IS true ONLY WHEN THE USER PROGRAM
- *  CHOOSES THE OPTION V4L2_FIELD_INTERLACED.
  */
 /*---------------------------------------------------------------------------*/
 static int field2frame(struct easycap *peasycap)
···
 	int rc, bytesperpixel, multiplier;
 	int  much, more, over, rump, caches, input;
 	u8 mask, margin;
-	bool odd, isuy, decimatepixel, offerfields, badinput;
+	bool odd, isuy, decimatepixel, badinput;
 
 	if (!peasycap) {
 		SAY("ERROR: peasycap is NULL\n");
···
 			peasycap->field_buffer[peasycap->field_read][0].input,
 			peasycap->field_read, peasycap->frame_fill);
 	JOM(8, "=====  %i=bytesperpixel\n", peasycap->bytesperpixel);
-	if (peasycap->offerfields)
-		JOM(8, "===== offerfields\n");
 
 /*---------------------------------------------------------------------------*/
 /*
···
 #endif /*EASYCAP_TESTCARD*/
 /*---------------------------------------------------------------------------*/
 
-	offerfields = peasycap->offerfields;
 	bytesperpixel = peasycap->bytesperpixel;
 	decimatepixel = peasycap->decimatepixel;
 

drivers/staging/media/easycap/easycap_sound.c

···
 static int easycap_alsa_trigger(struct snd_pcm_substream *pss, int cmd)
 {
 	struct easycap *peasycap;
-	int retval;
 
 	JOT(4, "%i=cmd cf %i=START %i=STOP\n", cmd, SNDRV_PCM_TRIGGER_START,
 	    SNDRV_PCM_TRIGGER_STOP);
···
 		break;
 	}
 	default:
-		retval = -EINVAL;
+		return -EINVAL;
 	}
 	return 0;
 }