powerpc/modules: Improve restore_r2() error message

Print the function address associated with the restore_r2() error to
make it easier to debug the problem.

Also clarify the wording a bit.

Before:

  module_64: patch_foo: Expect noop after relocate, got 3c820000

After:

  module_64: patch_foo: Expected nop after call, got 7c630034 at netdev_has_upper_dev+0x54/0xb0 [patch_foo]

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
[mpe: Change noop to nop, as that's the name of the instruction]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/module_64.c

@@ -501,8 +501,8 @@ static int restore_r2(u32 *instruction, struct module *me)
 		return 1;
 
 	if (*instruction != PPC_INST_NOP) {
-		pr_err("%s: Expect noop after relocate, got %08x\n",
-		       me->name, *instruction);
+		pr_err("%s: Expected nop after call, got %08x at %pS\n",
+			me->name, *instruction, instruction);
 		return 0;
 	}
 	/* ld r2,R2_STACK_OFFSET(r1) */