[MIPS] Change names of local variables to silence sparse
This patch is an workaround for these sparse warnings:
linux/include/linux/calc64.h:25:17: warning: symbol '__quot' shadows an earlier one
linux/include/linux/calc64.h:25:17: originally declared here
linux/include/linux/calc64.h:25:17: warning: symbol '__mod' shadows an earlier one
linux/include/linux/calc64.h:25:17: originally declared here