[PATCH] powerpc/cell spidernet variable name change

Cosmetic patch: give the variable holding the numer of descriptors
a more descriptive name, so to avoid confusion.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>