livepatch: Make 'klp_stack_entries' static

The 'klp_stack_entries' percpu array is only used in transition.c.  Make
it static.

Fixes: e92606f ("livepatch: Convert stack entries array to percpu")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/5115752fca6537720700f4bf5b178959dfbca41a.1685488550.git.jpoimboe@kernel.org

Author: jpoimboe

kernel/livepatch/transition.c

@@ -15,7 +15,7 @@
 #include "transition.h"
 
 #define MAX_STACK_ENTRIES  100
-DEFINE_PER_CPU(unsigned long[MAX_STACK_ENTRIES], klp_stack_entries);
+static DEFINE_PER_CPU(unsigned long[MAX_STACK_ENTRIES], klp_stack_entries);
 
 #define STACK_ERR_BUF_SIZE 128