ARM: 6519/1: kuser: Fix incorrect cmpxchg syscall in kuser helpers

The existing code invokes the syscall with rubbish in r7,
due to what looks like an incorrect literal load idiom.

Reviewed-by: Will Deacon <[e-mail]>
Signed-off-by: Dave Martin <[e-mail]>
Acked-by: Catalin Marinas <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/kernel/entry-armv.S

···
 	 * A special ghost syscall is used for that (see traps.c).
 	 */
 	stmfd	sp!, {r7, lr}
-	ldr	r7, =1f			@ it's 20 bits
+	ldr	r7, 1f			@ it's 20 bits
 	swi	__ARM_NR_cmpxchg
 	ldmfd	sp!, {r7, pc}
 1:	.word	__ARM_NR_cmpxchg