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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/isa/wavefront/wavefront_synth.c

···
 	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++) {