ALSA: wavefront: remove redundant assignment to pointer end

Pointer end is being re-assigned the same value as it was initialized
with in the previous statement. The re-assignment is redundant and
can be removed.

Cleans up clang scan-build warning:
sound/isa/wavefront/wavefront_synth.c:582:17: warning: Value stored
to 'end' during its initialization is never read
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220629102744.139673-1-colin.i.king@gmail.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/wavefront/wavefront_synth.c

@@ -581,8 +581,6 @@ demunge_buf (unsigned char *src, unsigned char *dst, unsigned int src_bytes)
 	int i;
 	unsigned char *end = src + src_bytes;
     
-	end = src + src_bytes;
-
 	/* NOTE: src and dst *CAN* point to the same address */
 
 	for (i = 0; src != end; i++) {