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This fixes a bug in stereo PLC (offset wasn't changed between channels)

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -646,11 +646,12 @@

             && norm_rate < 50;

    if (has_pitch)

    {

-      /* FIXME: Should probably do a stack save/pop here */

       VARDECL(celt_word16, x_lp);

+      SAVE_STACK;

       ALLOC(x_lp, (2*N-2*N4)>>1, celt_word16);

       pitch_downsample(in, x_lp, 2*N-2*N4, N, C, &st->xmem, &st->pitch_buf[MAX_PERIOD>>1]);

       pitch_search(st->mode, x_lp, st->pitch_buf, 2*N-2*N4, MAX_PERIOD-(2*N-2*N4), &pitch_index, &st->xmem);

+      RESTORE_STACK;

    }

    /* Deferred allocation after find_spectral_pitch() to reduce 

@@ -1269,8 +1270,8 @@

          fade = 0;

    }

-   offset = MAX_PERIOD-pitch_index;

 #ifdef FIXED_POINT

+   offset = MAX_PERIOD-pitch_index;

    ALLOC(freq,C*N, celt_sig); /**< Interleaved signal MDCTs */

    while (offset+len >= MAX_PERIOD)

       offset -= pitch_index;

@@ -1290,6 +1291,7 @@

       float decay = 1;

       celt_word32 mem[LPC_ORDER]={0};

+      offset = MAX_PERIOD-pitch_index;

       for (i=0;i<MAX_PERIOD;i++)

          exc[i] = st->out_mem[i*C+c];