ANDROID: lib: vsprintf: default kptr_restrict to the maximum value

Set the initial value of kptr_restrict to the maximum
setting rather than the minimum setting, to ensure that
early boot logging is not leaking information.

BUG: 30368199
Change-Id: If738e3b2ff85b737127daf16f2f3a722e616f389
Signed-off-by: Dave Weinstein <olorin@google.com>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 5aa1ad2..aab8925 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -378,7 +378,7 @@
 	s16	precision;	/* # of digits/chars */
 };
 
-int kptr_restrict __read_mostly;
+int kptr_restrict __read_mostly = 4;
 
 /*
  * Always cleanse %p and %pK specifiers