utils: Stacktrace fixup.

Fix loop condition in stacktrace.

Use %p for printing pointers in stacktrace.

Signed-off-by: Sonny Karlsson <ksonny@lotrax.org>
Signed-off-by: Eduardo Silva <edsiper@gmail.com>
utils: stacktrace add padding zeros to pointer addr

Signed-off-by: Eduardo Silva <edsiper@gmail.com>