Fix speex warning lsp.c->lsp_to_lpc

I'm pretty sure this was a false positive

Change-Id: I0ab375d1d844b3d468c24888c371f588052e1ce9
diff --git a/lib/rbcodec/codecs/libspeex/lsp.c b/lib/rbcodec/codecs/libspeex/lsp.c
index 83365a8..f19390a 100644
--- a/lib/rbcodec/codecs/libspeex/lsp.c
+++ b/lib/rbcodec/codecs/libspeex/lsp.c
@@ -459,7 +459,7 @@
 
     /* work out 2cos terms in Q14 */
 
-    ALLOC(freqn, lpcrdr, spx_word16_t);
+    ALLOC(freqn, (lpcrdr + 1), spx_word16_t);
     for (i=0;i<lpcrdr;i++) 
        freqn[i] = ANGLE2X(freq[i]);