staging: unisys: use the kernel min define

The kernel already provides a min function, we should be using that
instead of creating our own MINNUM.

Reviewed-by: Sameer Wadgaonkar <[e-mail]>
Signed-off-by: David Kershner <[e-mail]>
Reviewed-by: Tim Sell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/unisys/include/iochannel.h

···
  * IO Partition is defined below.
  */
 
-/* Defines and enums. */
-#define MINNUM(a, b) (((a) < (b)) ? (a) : (b))
-
 /*
  * Define the two queues per data channel between iopart and ioguestparts.
  *	IOCHAN_TO_IOPART -- used by guest to 'insert' signals to iopart.

drivers/staging/unisys/visornic/visornic_main.c

···
 };
 
 /* Returns next non-zero index on success or 0 on failure (i.e. out of room). */
-static u16 add_physinfo_entries(u64 inp_pfn, u16 inp_off, u32 inp_len,
+static u16 add_physinfo_entries(u64 inp_pfn, u16 inp_off, u16 inp_len,
 				u16 index, u16 max_pi_arr_entries,
 				struct phys_info pi_arr[])
 {
-	u32 len;
-	u16 i, firstlen;
+	u16 i, len, firstlen;
 
 	firstlen = PI_PAGE_SIZE - inp_off;
 	if (inp_len <= firstlen) {
···
 			pi_arr[index].pi_len = firstlen;
 		} else {
 			pi_arr[index + i].pi_off = 0;
-			pi_arr[index + i].pi_len =
-			    (u16)MINNUM(len, (u32)PI_PAGE_SIZE);
+			pi_arr[index + i].pi_len = min_t(u16, len,
+							 PI_PAGE_SIZE);
 		}
 	}
 	return index + i;