Bracket READ_TIMER macro in cpu/arm1136/omap24xx/interrupts.c

to prevent compilation error.
Signed-off-by: NPeter Pearse <peter.pearse@arm.com>

cpu/arm1136/omap24xx/interrupts.c

@@ -37,7 +37,7 @@
 #define TIMER_LOAD_VAL 0
 
 /* macro to read the 32 bit timer */
-#define READ_TIMER (*volatile ulong*(CFG_TIMERBASE+TCRR))
+#define READ_TIMER (*((volatile ulong*)(CFG_TIMERBASE+TCRR)))
 
 static ulong timestamp;
 static ulong lastinc;