fix the following sparse warning:
drivers/staging/fbtft/fbtft-io.c:74:29: warning: incorrect type in assignment
(different base types) drivers/staging/fbtft/fbtft-io.c:74:29:expected
unsigned long long [unsigned] [long] [long long] [usertype]
drivers/staging/fbtft/fbtft-io.c:74:29:got
fix the sparse warning:
drivers/staging/fbtft/fbtft-io.c:74:29:
warning: incorrect type in assignment (different base types)
drivers/staging/fbtft/fbtft-io.c:74:29:expected unsigned long
long [unsigned] [long] [long long] [usertype]
drivers/staging/fbtft/fbtft
