[PATCH] update-index: fix segfault with missing --cacheinfo argument

Running git update-index --cacheinfo without any further arguments results in a segfault rather than an error message. Commit ec160ae (update-index: teach --cacheinfo a new syntax mode,sha1,path, 2014-03-23) added code to examine the format of the argument, but forgot to handle the NULL case.

Re: [PATCH] update-index: fix segfault with missing --cacheinfo argument

Jeff King p...@peff.net writes: Running git update-index --cacheinfo without any further arguments results in a segfault rather than an error message. Commit ec160ae (update-index: teach --cacheinfo a new syntax mode,sha1,path, 2014-03-23) added code to examine the format of the argument,