Don't reject FAT file systems with a number of "Heads" greater than

255; USB keychains exist that use 256 as the number of heads.  This
check has also been removed in Darwin (along with most of the other
head/sector sanity checks).

sys/fs/msdosfs/msdosfs_vfsops.c

@@ -398,7 +398,7 @@ mountmsdosfs(devvp, mp, td, argp)
 
 	/* XXX - We should probably check more values here */
 	if (!pmp->pm_BytesPerSec || !SecPerClust
-		|| !pmp->pm_Heads || pmp->pm_Heads > 255
+		|| !pmp->pm_Heads
 #ifdef PC98
     		|| !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
 #else