powerpc/module: Fix stubs for BE

A simple patch which was supposed to swap r12 and r11 also
inexplicably changed the offset by two bytes.  This instruction
(to load r2) isn't used in LE, so it wasn't noticed.

Fixes: b1ce369e ("powerpc: modules: use r12 for stub jump address.)
Reported-by: NAlistair Popple <alistair@popple.id.au>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Tested-by: NAlistair Popple <alistair@popple.id.au>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/module_64.c

@@ -134,7 +134,7 @@ static u32 ppc64_stub_insns[] = {
 	0xe98b0020,			/* ld      r12,32(r11) */
 #if !defined(_CALL_ELF) || _CALL_ELF != 2
 	/* Set up new r2 from function descriptor */
-	0xe84b0026,			/* ld      r2,40(r11) */
+	0xe84b0028,			/* ld      r2,40(r11) */
 #endif
 	0x7d8903a6,			/* mtctr   r12 */
 	0x4e800420			/* bctr */