powerpc/hvc_udbg: Don't crash when udbg_putc is NULL
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 14 Mar 2012 07:37:04 +0000 (18:37 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 15 Mar 2012 22:28:15 +0000 (09:28 +1100)
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>

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