clover: use correct typenames for compat::pair's first/second

Seems to be a typo judging from the overall declaration of the
template.

Cc: EdB <edb+mesa@sigluy.net>
Cc: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
1 file changed