[PATCH] Infinite loop/always true check possible with unsigned counter.

[Manish Ahuja]

Fix to correct a possible infinite loop or an always true check when the 
unsigned long counter "i" is used in
lmb_add_region() in the following for loop:

for (i = rgn->cnt-1; i >= 0; i--)

Signed-off-by: Manish Ahuja <ahuja at us.ibm.com>

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