ALSA: Cleanup redundant tests on unsigned

The variables are unsigned so the test `>= 0' is always true,
the `< 0' test always fails. In these cases the other part of
the test catches wrapped values.

In dac_audio_write() there does not occur a test for wrapped
values, but the test appears redundant.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ctxfi/ctatc.c

@@ -240,7 +240,7 @@ static int select_rom(unsigned int pitch)
 	} else if (pitch == 0x02000000) {
 		/* pitch == 2 */
 		return 3;
-	} else if (pitch >= 0x0 && pitch <= 0x08000000) {
+	} else if (pitch <= 0x08000000) {
 		/* 0 <= pitch <= 8 */
 		return 0;
 	} else {