swapon: don't use empty strings for smartcols output

The libsmartcols is smart enough to accept NULL for empty fields
rather than empty strings.

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/sys-utils/swapon.c b/sys-utils/swapon.c
index 0c8ca03e147bf9839fedddb8bc27f7a511d685ac..02cad024a51d11d934804e6ecefe658f894b7648 100644 (file)
--- a/sys-utils/swapon.c
+++ b/sys-utils/swapon.c
@@ -199,17 +199,13 @@ static void add_scols_line(struct libscols_table *table, struct libmnt_fs *fs, i
                case COL_UUID:
                        if (pr && !blkid_probe_lookup_value(pr, "UUID", &data, NULL))
                                xasprintf(&str, "%s", data);
-                       else if (pr)
-                               xasprintf(&str, "");
-                       else
+                       else if (!pr)
                                xasprintf(&str, _("read failed"));
                        break;
                case COL_LABEL:
                        if (pr && !blkid_probe_lookup_value(pr, "LABEL", &data, NULL))
                                xasprintf(&str, "%s", data);
-                       else if (pr)
-                               xasprintf(&str, "");
-                       else
+                       else if (!pr)
                                xasprintf(&str, _("read failed"));
                        break;
                default: