mm,page_owner: drop unnecessary check

stackdepot only saves stack_records which size is greather than 0,
so we cannot possibly have empty stack_records.
Drop the check.

Link: https://lkml.kernel.org/r/20240306123217.29774-3-osalvador@suse.deSigned-off-by: Oscar Salvador <osalvador@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: kernel test robot <oliver.sang@intel.com>
Cc: Marco Elver <elver@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/page_owner.c

@@ -865,8 +865,7 @@ static int stack_print(struct seq_file *m, void *v)
 	entries = stack_record->entries;
 	stack_count = refcount_read(&stack_record->count) - 1;
 
-	if (!nr_entries || nr_entries < 0 || stack_count < 1 ||
-	    stack_count < page_owner_stack_threshold)
+	if (stack_count < 1 || stack_count < page_owner_stack_threshold)
 		return 0;
 
 	for (i = 0; i < nr_entries; i++)