kernel/linux: remove unneeded meson variables
The local variables for the error message aren't needed, since the messages
aren't used more than once, and the indent levels are now such that the
lines printing the message are not much longer than the lines defining the
variables to hold the messages themselves. Therefore the use of the
variables is pointless.
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Acked-by: Luca Boccassi <bluca@debian.org>