staging:comedi: Fix sparse warnings of incorrect type in assignment

This patch fixes the following sparse warnings:
drivers/staging/comedi/drivers/mite.c:343:44: warning: incorrect type in assignment (different base types)
drivers/staging/comedi/drivers/mite.c:343:44:    expected unsigned int [unsigned] [usertype] count
drivers/staging/comedi/drivers/mite.c:343:44:    got restricted __le32 [usertype] <noident>
drivers/staging/comedi/drivers/mite.c:344:43: warning: incorrect type in assignment (different base types)
drivers/staging/comedi/drivers/mite.c:344:43:    expected unsigned int [unsigned] [usertype] addr
drivers/staging/comedi/drivers/mite.c:344:43:    got restricted __le32 [usertype] <noident>
drivers/staging/comedi/drivers/mite.c:346:43: warning: incorrect type in assignment (different base types)
drivers/staging/comedi/drivers/mite.c:346:43:    expected unsigned int [unsigned] [usertype] next
drivers/staging/comedi/drivers/mite.c:346:43:    got restricted __le32 [usertype] <noident>
drivers/staging/comedi/drivers/mite.c:351:45: warning: incorrect type in assignment (different base types)
drivers/staging/comedi/drivers/mite.c:351:45:    expected unsigned int [unsigned] [usertype] next
drivers/staging/comedi/drivers/mite.c:351:45:    got restricted __le32 [usertype] <noident>

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>