CLEANUP: config: fix typo inteface => interface

This was in an error message.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index cd3a559d..8a04499 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -4848,7 +4848,7 @@
 				continue;
 			}
 			Alert("parsing [%s:%d] : '%s' only supports optional keywords '%s' and '%s'.\n",
-			      file, linenum, args[0], "inteface", "usesrc");
+			      file, linenum, args[0], "interface", "usesrc");
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;
 		}