Description of problem:
With grep-2.4.2, using the -C (context) option without specifying number of
lines worked, but with versions 2.5e-3 and 2.5e-4, invoking grep with the
same option dumps core.

How reproducible:
Always

Steps to Reproduce:
1.grep -C regexp file (for any regexp and file)
	

Actual Results:  grep crashes.

Expected Results:  grep should have printed occurrences of regexp in file,
with output context.


Additional info: