MT#59962 libisac: fix off-by-one

There are only 144 elements in the array.

Change-Id: I452aca5ce46e8dce2c321b7409df7720a4f99776
Warned-by: Coverity

core/plug-in/isac/libisac/entropy_coding.c

@@ -2137,7 +2137,7 @@ int WebRtcIsac_DecodePitchGain(Bitstr *streamdata, WebRtc_Word16 *PitchGains_Q12
   *WebRtcIsac_kQPitchGainCdf_ptr = WebRtcIsac_kQPitchGainCdf;
   err = WebRtcIsac_DecHistBisectMulti(&index_comb, streamdata, WebRtcIsac_kQPitchGainCdf_ptr, WebRtcIsac_kQCdfTableSizeGain, 1);
   /* error check, Q_mean_Gain.. tables are of size 144 */
-  if ((err<0) || (index_comb<0) || (index_comb>144))
+  if ((err<0) || (index_comb<0) || (index_comb>=144))
     return -ISAC_RANGE_ERROR_DECODE_PITCH_GAIN;
 
   /* unquantize back to pitch gains by table look-up */