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powerpc/udbg: Make it safe to call udbg_printf() always
Make udbg_printf() check if udbg_putc is set, and if not just return. This makes it safe to call udbg_printf() anytime, even when a udbg backend has not been registered, which means we can avoid some ifdefs at call sites. Signed-off-by: Qian Cai <cai@lca.pw> [mpe: Split out of larger patch, write change log] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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