Corrected "Misssing" to "Missing".

Signed-off-by: Osmar Gonzalez <mibs510@gmail.com>
---
diff --git a/src/setup/networking.c b/src/setup/networking.c
index 0791764..1067b95 100644
--- a/src/setup/networking.c
+++ b/src/setup/networking.c
@@ -213,7 +213,7 @@ int oktoleave(void)
                strcpy(temp, ""); findkey(kv, "DNS1", temp);
                if (!(strlen(temp)))
                {
-                       errorbox(_("Misssing DNS."));
+                       errorbox(_("Missing DNS."));
                        freekeyvalues(kv);
                        return 0;
                }