iLBC: Handle a case of bad input data

webrtc/modules/audio_coding/codecs/ilbc/decode.h

Index: webrtc/modules/audio_coding/codecs/ilbc/decode.h
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/decode.h b/webrtc/modules/audio_coding/codecs/ilbc/decode.h
index 0c4c2ef844a61c271fac81cbe8ad2aadbf87d2d9..f45fedd7b357efae0344137e6d9dc19fdb47eaaf 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/decode.h
+++ b/webrtc/modules/audio_coding/codecs/ilbc/decode.h
@@ -25,13 +25,14 @@
  *  main decoder function
  *---------------------------------------------------------------*/
 
-void WebRtcIlbcfix_DecodeImpl(
-    int16_t *decblock,    /* (o) decoded signal block */
-    const uint16_t *bytes, /* (i) encoded signal bits */
-    IlbcDecoder *iLBCdec_inst, /* (i/o) the decoder state
+// Returns 0 on success, -1 on error.
+int WebRtcIlbcfix_DecodeImpl(
+    int16_t* decblock,         /* (o) decoded signal block */
+    const uint16_t* bytes,     /* (i) encoded signal bits */
+    IlbcDecoder* iLBCdec_inst, /* (i/o) the decoder state
                                            structure */
-    int16_t mode      /* (i) 0: bad packet, PLC,
-                                                                   1: normal */
-                           );
+    int16_t mode               /* (i) 0: bad packet, PLC,
+                                      1: normal */
+    ) WARN_UNUSED_RESULT;
 
 #endif