'git log' returns SIGPIPE (141) in normal operation; annoying status at prompt start

[findurance]

Since SIGPIPE is normal operation in 'git log' use, I think it should not be indicated as too much of an error on the prompt line. Now it always says "X-PIPE" after exiting 'git log' command, which is rather frequent operation for a Git user, and as such showing the red error is unnecesary noise.