Add error message to failed open(2) calls inside the copy() function of

app_voicemail. This idea came as part of my work in helping to resolve
issue #12764.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@127244 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_voicemail.c

@@ -1546,11 +1546,11 @@ static int copy(char *infile, char *outfile)
 	if (link(infile, outfile)) {
 #endif
 		if ((ifd = open(infile, O_RDONLY)) < 0) {
-			ast_log(LOG_WARNING, "Unable to open %s in read-only mode\n", infile);
+			ast_log(LOG_WARNING, "Unable to open %s in read-only mode: %s\n", infile, strerror(errno));
 			return -1;
 		}
 		if ((ofd = open(outfile, O_WRONLY | O_TRUNC | O_CREAT, VOICEMAIL_FILE_MODE)) < 0) {
-			ast_log(LOG_WARNING, "Unable to open %s in write-only mode\n", outfile);
+			ast_log(LOG_WARNING, "Unable to open %s in write-only mode: %s\n", outfile, strerror(errno));
 			close(ifd);
 			return -1;
 		}