gitweb: remove unnecessary test when closing file descriptor

It happens that closing file descriptor fails whereas the blob is perfectly readable. According to perlman the reasons could be: If the file handle came from a piped open, "close" will additionally return false if one of the other system calls involved fails, or if the program exits with non-zero status. (If the only problem was that the program exited non-zero, $! will be set to 0.) Closing a pipe also waits for the process executing on the pipe to complete, in case you want to look at the output of the pipe afterwards, and implicitly puts the exit status value of that command into $?. Prematurely closing the read end of a pipe (i.e. before the process writ- ing to it at the other end has closed it) will result in a SIGPIPE being delivered to the writer. If the other end can't handle that, be sure to read all the data before closing the pipe. In this case we don't mind that close fails. Signed-off-by: Sylvain Rabot <sylvain@abstraction.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>