arm64: dump: Remove max_addr

max_addr was added as part of struct ptdump_info but has never actually
been used. Remove it.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/ptdump.h

@@ -30,7 +30,6 @@ struct ptdump_info {
 	struct mm_struct		*mm;
 	const struct addr_marker	*markers;
 	unsigned long			base_addr;
-	unsigned long			max_addr;
 };
 
 void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);