Fixes debug message in do_mounts for WC.

There was an index bug that I forgot to remove from the parent patch
(an unneeded '+ 9' after root_device_name).  Now when a kernel panic
is encountered, the appropriate root device name will be printed
instead of an empty string (or junk memory).

Change-Id: Ie6de75b73033eae4b98f2a862e86cdd70a91afc6
1 file changed