powerpc/xmon: Deindent the SLB dumping logic

Currently the code that dumps SLB entries uses a double-nested if. This
means the actual dumping logic is a bit squashed. Deindent it by using
continue.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Rashmica Gupta <rashmica.g@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>