rumprun: fix -W t,inet,dhcp under set -u

diff --git a/app-tools/rumprun b/app-tools/rumprun
index 8809cebc14d3482e2c44b4a32fa218e8634979c4..0f675a892a64c3869f171744890240a7ec57e25d 100644 (file)
--- a/app-tools/rumprun
+++ b/app-tools/rumprun
@@ -273,7 +273,7 @@ json_store_netspec ()
        json_append_ln  '"type":        "'${iftype}'"'
        json_append_ln  '"method":      "'${ifmethod}'"'
 
-       [ -n "${ifaddr}" ] || { json_finalize_block ; return ; }
+       [ -n "${ifaddr:-}" ] || { json_finalize_block ; return ; }
 
        json_append_ln  '"addr":        "'${ifaddr}'"'
        json_append_ln  '"mask":        "'${ifmask}'"'