mm/kmemleak: use %pK to display kernel pointers in backtrace

Currently, %p is used to display kernel pointers in backtrace which result
in a hashed value that is not usable to correlate the address for debug. 
Use %pK which will respect the kptr_restrict configuration value and thus
allow to extract meaningful information from the backtrace.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Clément Léger <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/kmemleak.c

@@ -361,7 +361,7 @@ static void print_unreferenced(struct seq_file *seq,
 
 	for (i = 0; i < nr_entries; i++) {
 		void *ptr = (void *)entries[i];
-		warn_or_seq_printf(seq, "    [<%p>] %pS\n", ptr, ptr);
+		warn_or_seq_printf(seq, "    [<%pK>] %pS\n", ptr, ptr);
 	}
 }