Fix divide by zero (bugs #2268 and 2259)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3626 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/dsp.c b/dsp.c
index 5d61ff8..e637aa6 100755 (executable)
--- a/dsp.c
+++ b/dsp.c
@@ -1228,6 +1228,9 @@ static int __ast_dsp_silence(struct ast_dsp *dsp, short *s, int len, int *totals
        int accum;
        int x;
        int res = 0;
+
+       if (!len)
+               return 0;
        
        accum = 0;
        for (x=0;x<len; x++)