ALSA: au88x0: remove redundant assignment of variable i

The assignment to variable i is redundant as it is never read
because it is updated a little later on. Remove this assignment.
Cleans up clang warning: Value stored to 'i' is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/au88x0/au88x0_core.c

@@ -2628,7 +2628,7 @@ static void vortex_spdif_init(vortex_t * vortex, int spdif_sr, int spdif_mode)
 			else
 				edi = 0x1ffff;
 		} else {
-			i = edi = 0x800;
+			edi = 0x800;
 		}
 		/* this_04 and this_08 are the CASp4Src's (samplerate converters) */
 		vortex_src_setupchannel(vortex, this_04, edi, 0, 1,