make overflow test on delta base offset work regardless of variable size
This patch introduces the MSB() macro to obtain the desired number of most significant bits from a given variable independently of the variable type. It is then used to better implement the overflow test on the OBJ_OFS_DELTA base offset variable with the property of always working correctly regardless of the type/size of that variable. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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