[PATCH v2.1 ] Fix VDSO gettimeofday() when called with NULL struct timeval.

[Will Schmidt]

The vdso64 portion of patch 74609f4536f2b8fd6a48381bbbe3cd37da20a527 for
fixing problems with NULL gettimeofday input mistakenly checks for a
null tz field twice, when it should be checking for null tz once, and
null tv once; by way of a r10/r11 typo. 

Any application calling gettimeofday(&tv,NULL) will "fail".

This corrects that typo, and makes my G5 happy.

tested on G5. 


Signed-off-by: Will Schmidt <will_schmidt at vnet.ibm.com>
cc: Tony Breeds <tony at bakeyournoodle.com>
cc: Ben Herrenschmidt <benh at kernel.crashing.org>

---

diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 2d7a510..c6401f9 100644
--- a/arch/powerpc/kernel/vdso64/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso64/gettimeofday.S
@@ -31,7 +31,7 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
 	mr	r11,r3			/* r11 holds tv */
 	mr	r10,r4			/* r10 holds tz */
 	bl	V_LOCAL_FUNC(__get_datapage)	/* get data page */
-	cmpldi	r10,0			/* check if tv is NULL */
+	cmpldi	r11,0			/* check if tv is NULL */
 	beq	2f
 	bl	V_LOCAL_FUNC(__do_get_xsec)	/* get xsec from tb & kernel */
 	lis     r7,15			/* r7 = 1000000 = USEC_PER_SEC */