Eliminate left shift of negative value by using multiplication instead

webrtc/modules/audio_coding/codecs/g722/g722_decode.c

 /*
  * SpanDSP - a series of DSP components for telephony
  *
  * g722_decode.c - The ITU G.722 codec, decode part.
  *
  * Written by Steve Underwood <steveu@coppice.org>
  *
  * Copyright (C) 2005 Steve Underwood
  *
  *  Despite my general liking of the GPL, I place my own contributions
@@ skipping 59 matching lines @@
     /* Block 4, RECONS */
     s->band[band].d[0] = d;
     s->band[band].r[0] = saturate(s->band[band].s + d);
 
     /* Block 4, PARREC */
     s->band[band].p[0] = saturate(s->band[band].sz + d);
 
     /* Block 4, UPPOL2 */
     for (i = 0;  i < 3;  i++)
         s->band[band].sg[i] = s->band[band].p[i] >> 15;
-    wd1 = saturate(s->band[band].a[1] << 2);
+    wd1 = saturate(s->band[band].a[1] * 4);
 
     wd2 = (s->band[band].sg[0] == s->band[band].sg[1])  ?  -wd1  :  wd1;
     if (wd2 > 32767)
         wd2 = 32767;
     wd3 = (s->band[band].sg[0] == s->band[band].sg[2])  ?  128  :  -128;
     wd3 += (wd2 >> 7);
     wd3 += (s->band[band].a[2]*32512) >> 15;
     if (wd3 > 12288)
         wd3 = 12288;
     else if (wd3 < -12288)
@@ skipping 300 matching lines @@
                 /* WebRtc, tlegrand: added saturation */
                 amp[outlen++] = saturate(xout1 >> 11);
                 amp[outlen++] = saturate(xout2 >> 11);
             }
         }
     }
     return outlen;
 }
 /*- End of function --------------------------------------------------------*/
 /*- End of file ------------------------------------------------------------*/