x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG_SMP

The __ref_stack_chk_guard symbol doesn't exist on UP:

  <stdin>:4:15: error: ‘__ref_stack_chk_guard’ undeclared here (not in a function)

Fix the #ifdef around the entry.S export.

Signed-off-by: Ingo Molnar <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Uros Bizjak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ingo Molnar

arch/x86/entry/entry.S

@@ -64,6 +64,6 @@ THUNK warn_thunk_thunk, __warn_thunk
  * entirely in the C code, and use an alias emitted by the linker script
  * instead.
  */
-#ifdef CONFIG_STACKPROTECTOR
+#if defined(CONFIG_STACKPROTECTOR) && defined(CONFIG_SMP)
 EXPORT_SYMBOL(__ref_stack_chk_guard);
 #endif