Remove a check that is too strict. With BIOSen that specify an IO/ctl…

… port

of 0x3f2-0x3f5,0x3f7 the ports are not 7 bytes apart.  This should fix
floppy probing on such systems.  (We handle the case of adjusting for
a start of 0x3f2 -> 0x3f0 separately, although that code should still be
checked if there are still floppy problems for others.)

Tested by:	Sarunas Vancevicius <vsarunas_at_eircom.net>
MFC after:	3 days

sys/dev/fdc/fdc_isa.c

@@ -102,10 +102,6 @@ fdc_isa_alloc_resources(device_t dev, struct fdc_data *fdc)
 				fdc->rid_ctl = i;
 			}
 		}
-		if (min_start + 7 != max_start) {
-			device_printf(dev, "I/O to control range incorrect\n");
-			return (ENXIO);
-		}
 	}
 
 	fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,