microblaze: Disabling interrupt should return 1 if was enabled

Microblaze implement enable/disable interrupts through MSR
that's why disable_interrupts function should return 1 when interrupt
was enabled. Return 0 when interrupt was disabled.

Signed-off-by: John Linn <john.linn@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Wolfgang Denk <wd@denx.de>

arch/microblaze/cpu/interrupts.c

@@ -41,8 +41,11 @@ void enable_interrupts (void)
 
 int disable_interrupts (void)
 {
+	unsigned int msr;
+
+	MFS(msr, rmsr);
 	MSRCLR(0x2);
-	return 0;
+	return (msr & 0x2) != 0;
 }
 
 #ifdef CONFIG_SYS_INTC_0