Remove memset from pop front

Author: krkind

Diff for: circularbuffer.c

@@ -111,8 +111,6 @@ int32_t CircularBufferPopFront(CircularBufferContext *ctx, void *val) {
     memcpy(val, &ctx->buf[ctx->read_pos * ctx->element_size],
            ctx->element_size);
 
-    memset(&ctx->buf[ctx->read_pos * ctx->element_size], 0, ctx->element_size);
-
     ctx->read_pos = (ctx->read_pos + 1) & ctx->max_size;
 
     return 0;