freezer: comment out might_sleep()

Currently on ARM signal handling here must happen with
interrupts disabled so this might_sleep will cause a
continuous stream of warnings. It is a known issue
upstream.

Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
(cherry picked from commit dc0eed4422dad92d3dd5afd468876d3d5b241ce1)

include/linux/freezer.h

@@ -43,7 +43,10 @@ extern void thaw_kernel_threads(void);
 
 static inline bool try_to_freeze(void)
 {
-	might_sleep();
+/* This causes problems for ARM targets and is a known
+ * problem upstream.
+ *	might_sleep();
+ */
 	if (likely(!freezing(current)))
 		return false;
 	return __refrigerator(false);