[ros-kernel] Bugs in vfat and cdfs

[Hervé Poussineau]

Hello !

I found some bugs in fs drivers

1) CDFS :
C:\>vol e:
    Volume in drive E: is REA
    Volume Serial Number is 1557-D9AF
Only first half-part of volume name is displayed
Attached patch in "Volume name in cdfs.patch"

2) VFAT :
In VfatHasFileSystem, we try to divide by a number that may be 0 if
bootsector is not correct/is not FAT.
Basically, proposed patch adds an "if (value != 0)"
Attached patch in "Handle non fat boot sectors.patch"

Herve
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