Http download issue when connection lost (#723)

* Fix bug when read returns -1

When the socket down the "read" function returns -1.
Then the while(read_byte > 0) only works for signed types.

* Remove printf debug line

extras/http_client_ota/http_buffered_client.c

@@ -110,7 +110,8 @@ static inline void parse_http_header(char *header)
 HTTP_Client_State HttpClient_dowload(Http_client_info *info)
 {
     struct addrinfo *res;
-    unsigned int tot_http_pdu_rd, read_byte, full;
+    unsigned int tot_http_pdu_rd, full;
+    ssize_t read_byte;
     int err, sock;
     char *wrt_ptr;