A Patch for kgdb

[Jessica Han]

I got an infinite loop while trying to debug a kernel core on FreeBSD 6.1.
# uname -sr
FreeBSD 6.1-RELEASE
#kgdb kernel vmcore.0
kgdb: kvm_read: invalid address (0x50012)
kgdb: kvm_read: invalid address (0x7)
kgdb: kvm_read: invalid address (0xf5c)
kgdb: kvm_read: invalid address (0xf5c)
kgdb: kvm_read: invalid address (0xf5c)

The attached patch fixed it, can somebody review it for me and commit it 
if it is okay? Thanks,

Jessica
jessicah at juniper.net

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