po: add xgettext hint for non-c-format string

Reported-by: Petr Pisar <petr.pisar@atlas.cz>
Signed-off-by: Karel Zak <kzak@redhat.com>

sys-utils/irq-common.c

@@ -479,6 +479,7 @@ struct libscols_table *get_scols_cpus_table(struct irq_output *out,
 
 	/* per cpu % of delta */
 	ln = new_scols_line(table);
+	/* xgettext:no-c-format */
 	if (!ln || (!out->json && scols_line_set_data(ln, 0, _("%delta:")) != 0))
 		goto err;