Merged revisions 284897 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

................
  r284897 | twilson | 2010-09-03 11:20:45 -0500 (Fri, 03 Sep 2010) | 12 lines
  
  Merged revisions 284881 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r284881 | twilson | 2010-09-03 11:10:23 -0500 (Fri, 03 Sep 2010) | 5 lines
    
    Properly detect when a sound file doesn't exist
    
    ast_fileexists returns -1 for error and 0 for a non-existant file. The existing
    code treated missing files as though they existed.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@284921 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_chanspy.c

@@ -927,7 +927,7 @@ static int common_exec(struct ast_channel *chan, struct ast_flags *flags,
 				}
 				if (!ast_test_flag(flags, OPTION_NAME) || res < 0) {
 					if (!ast_test_flag(flags, OPTION_NOTECH)) {
-						if (ast_fileexists(peer_name, NULL, NULL) != -1) {
+						if (ast_fileexists(peer_name, NULL, NULL) > 0) {
 							res = ast_streamfile(chan, peer_name, chan->language);
 							if (!res) {
 								res = ast_waitstream(chan, "");