email plugin: constify

diff --git a/src/email.c b/src/email.c
index 63b6a56..81ae29c 100644 (file)
--- a/src/email.c
+++ b/src/email.c
@@ -389,8 +389,8 @@ static void *open_connection (void __attribute__((unused)) *arg)
 {
        struct sockaddr_un addr;
 
-       char *path  = (NULL == sock_file) ? SOCK_PATH : sock_file;
-       char *group = (NULL == sock_group) ? COLLECTD_GRP_NAME : sock_group;
+       const char *path  = (NULL == sock_file) ? SOCK_PATH : sock_file;
+       const char *group = (NULL == sock_group) ? COLLECTD_GRP_NAME : sock_group;
 
        /* create UNIX socket */
        errno = 0;