Fix wrong memset at LFHardwareAudioEncoder

ref: LaiFengiOS#233

Author: Superbil

LFLiveKit/coder/LFHardwareAudioEncoder.m

@@ -68,7 +68,7 @@ - (void)encodeAudioData:(nullable NSData*)audioData timeStamp:(uint64_t)timeStam
         char *totalBuf = malloc(totalSize);
         char *p = totalBuf;
 
-        memset(totalBuf, (int)totalSize, 0);
+        memset(totalBuf, 0, (int)totalSize);
         memcpy(totalBuf, leftBuf, leftLength);
         memcpy(totalBuf + leftLength, audioData.bytes, audioData.length);