make fxotune not segfault when config file is not present

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@793 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 5 insertions, 0 deletions

diff --git a/fxotune.c b/fxotune.c
index 8a7ad19..f518260 100755
--- a/fxotune.c
+++ b/fxotune.c
@@ -282,6 +282,11 @@ set:
 
 		fp = fopen(configfile, "r");
 
+                if (!fp) {
+                        fprintf(stdout, "Cannot open %s!\n",configfile);
+                        return -1;
+                }
+
 		for (i = 0;res != EOF; i++) {
 			struct wctdm_echo_coefs mycoefs;
 			char completezappath[56] = "";