Benjamin Herrenschmidt 7d3d897a46 powerpc/hvc_udbg: Don't crash when udbg_putc is NULL
Also while at it, add some help text indicating why you shouldn't
enable that driver under normal circumstances

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-03-16 09:28:15 +11:00
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