[Crash-utility] [PATCH 2/11] New convenience function: get_cpumask_buf

[Petr Tesarik]

Make a convenience function for allocating a cpumask buffer and 
put it into tools.c. Since any caller of make_cpumask() needs
such a buffer, it is better to isolate the code in a function
rather than copy it all over the place.

Signed-off-by: Petr Tesarik <ptesarik at suse.cz>
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