FS-4622 --resolve

src/switch_resample.c

@@ -273,24 +273,17 @@ SWITCH_DECLARE(uint32_t) switch_unmerge_sln(int16_t *data, uint32_t samples, int
 
 SWITCH_DECLARE(void) switch_mux_channels(int16_t *data, switch_size_t samples, uint32_t channels)
 {
-	int16_t *buf;
-	switch_size_t len = samples * sizeof(int16_t);
 	switch_size_t i = 0;
-	uint32_t j = 0, k = 0;
-
-	switch_zmalloc(buf, len);
+	uint32_t j = 0;
 
 	for (i = 0; i < samples; i++) {
+		int32_t z = 0;
 		for (j = 0; j < channels; j++) {
-			int32_t z = buf[i] + data[k++];
+			z += data[i * channels + j];
 			switch_normalize_to_16bit(z);
-			buf[i] = (int16_t) z;
+			data[i] = (int16_t) z;
 		}
 	}
-
-	memcpy(data, buf, len);
-	free(buf);
-
 }
 
 SWITCH_DECLARE(void) switch_change_sln_volume_granular(int16_t *data, uint32_t samples, int32_t vol)