fix bitwise flag unsetting

diff --git a/src/switch_core_io.c b/src/switch_core_io.c
index 04b9ca46e3c8244d013b8747dd9575f85896697d..35375ddfd9d4a248976ba1e7c6b38c81263c052a 100644 (file)
--- a/src/switch_core_io.c
+++ b/src/switch_core_io.c
@@ -507,7 +507,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_read_frame(switch_core_sessi
                                if (session->plc) {
                                        plc_fillin(session->plc, session->raw_read_frame.data, read_frame->codec->implementation->decoded_bytes_per_packet / 2);
                                        is_cng = 0;
-                                       flag &= !SFF_CNG;
+                                       flag &= ~SFF_CNG;
                                } else {
                                        memset(session->raw_read_frame.data, 255, read_frame->codec->implementation->decoded_bytes_per_packet);
                                }