MIPS: TXx9: Fix possible overflow in clock calculations

Addition of -fwrapv option in 2.6.29 discloses possible overflow with
signed arithmetics.  For example, result of "a * 6 / 12" (int a =
400000000) is 200000000 without -fwrapv but -157913941 with -fwrapv.

Change some variable to unsigned to avoid such overflows.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/txx9/generic/setup_tx4927.c

@@ -88,7 +88,7 @@ void __init tx4927_setup(void)
 {
 	int i;
 	__u32 divmode;
-	int cpuclk = 0;
+	unsigned int cpuclk = 0;
 	u64 ccfg;
 
 	txx9_reg_res_init(TX4927_REV_PCODE(), TX4927_REG_BASE,

arch/mips/txx9/generic/setup_tx4938.c

@@ -93,7 +93,7 @@ void __init tx4938_setup(void)
 {
 	int i;
 	__u32 divmode;
-	int cpuclk = 0;
+	unsigned int cpuclk = 0;
 	u64 ccfg;
 
 	txx9_reg_res_init(TX4938_REV_PCODE(), TX4938_REG_BASE,

arch/mips/txx9/generic/setup_tx4939.c

@@ -114,7 +114,7 @@ void __init tx4939_setup(void)
 	int i;
 	__u32 divmode;
 	__u64 pcfg;
-	int cpuclk = 0;
+	unsigned int cpuclk = 0;
 
 	txx9_reg_res_init(TX4939_REV_PCODE(), TX4939_REG_BASE,
 			  TX4939_REG_SIZE);