fix warnings

llarp/address_info.c

@@ -6,7 +6,7 @@
 
 bool llarp_ai_bdecode(struct llarp_ai *ai, llarp_buffer_t *buff)
 {
-
+  return false;
 }
 
 bool llarp_ai_bencode(struct llarp_ai *ai, llarp_buffer_t *buff) {

llarp/buffer.cpp

@@ -43,7 +43,7 @@ bool llarp_buffer_readfile(llarp_buffer_t* buff, FILE* f, llarp_alloc* mem) {
     buff->base = static_cast<char*>(mem->alloc(len, 8));
     buff->cur = buff->base;
     buff->sz = len;
-    size_t sz = fread(buff->base, len, 1, f);
+    ssize_t sz = fread(buff->base, len, 1, f);
     rewind(f);
     return sz == len;
   }