[ARM] 5232/1: Do not post-index STRT instruction in clear_user.S

The last strnebt instruction has a post-index of 1 but the address
register is set to 0 in the next instruction, so no need for
post-indexing.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/lib/clear_user.S

@@ -41,7 +41,7 @@ USER(		strplt	r2, [r0], #4)
 USER(		strnebt	r2, [r0], #1)
 USER(		strnebt	r2, [r0], #1)
 		tst	r1, #1			@ x1 x0 x1 x0 x1 x0 x1
-USER(		strnebt	r2, [r0], #1)
+USER(		strnebt	r2, [r0])
 		mov	r0, #0
 		ldmfd	sp!, {r1, pc}
 ENDPROC(__clear_user)