The 'v' variable isn't defined in this part of the 'TracepointFmt'
rule but because of the way the generator produces code (one function
per rule) it doesn't realize we're accessing a variable from a
different case of the rule and this doesn't lead to a C compiler error
on undefined variable.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>