[ARM] Remove RETINSTR macro

RETINSTR is a left-over from the days when we had 26-bit and
32-bit CPU support integrated into the same tree.  Since this
is no longer the case, we can now remove RETINSTR.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/lib/io-readsw-armv3.S b/arch/arm/lib/io-readsw-armv3.S
index 146d47c..2639983 100644
--- a/arch/arm/lib/io-readsw-armv3.S
+++ b/arch/arm/lib/io-readsw-armv3.S
@@ -28,7 +28,7 @@
 		strb	r3, [r1], #1
 
 		subs	r2, r2, #1
-		RETINSTR(moveq, pc, lr)
+		moveq	pc, lr
 
 ENTRY(__raw_readsw)
 		teq	r2, #0		@ do we have to check for the zero len?