Rename .data.init_irqstack to .data..init_irqstack.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/arch/um/kernel/init_task.c b/arch/um/kernel/init_task.c
index 8aa77b6..ddc9698 100644
--- a/arch/um/kernel/init_task.c
+++ b/arch/um/kernel/init_task.c
@@ -34,5 +34,5 @@
 	{ INIT_THREAD_INFO(init_task) };
 
 union thread_union cpu0_irqstack
-	__attribute__((__section__(".data.init_irqstack"))) =
+	__attribute__((__section__(".data..init_irqstack"))) =
 		{ INIT_THREAD_INFO(init_task) };