Re: [PATCH 1/2] Added use of xmalloc() on diff-delta.c

These two functions, create_delta_index() and create_delta(),
are already nicely libified.  They allow the caller to deal with
oom condition.  The caller may die(), or it may decide to
continue its operation with reduced functionality without using
delta data.  A good example of this is found a few lines after
the lines the second patch touches.  When create_delta() cannot
find memory to work with, the entire function returns 0, saying
"sorry, cannot deltify these two", which would cause the object
stored without deltification.

These patches take that nice property away, making libification
more difficult, which is the downside.  Is there an upside?

If anything, I suspect that the part that calls die() you
touched in the second patch could return NULL.