core: tcp - remove level and function name from log message

(cherry picked from commit 5fe61ec6dbcd9d2dde3f2bd978dad5130ac5bff9)

src/core/tcp_read.c

@@ -1522,8 +1522,7 @@ again:
 
 		if(unlikely(bytes < 0)) {
 			LOG(cfg_get(core, core_cfg, corelog),
-					"ERROR: tcp_read_req: error reading - c: %p r: %p (%d)\n",
-					con, req, bytes);
+					"error reading - c: %p r: %p (%d)\n", con, req, bytes);
 			resp = CONN_ERROR;
 			goto end_req;
 		}