bug: request-pull broken when remote name contains a slash

Hello,

the remotes in my linux repo look as follows:

	[remote "ptx/ukl"]
		url = git://git.pengutronix.de/git/ukl/linux-2.6.git
		push = +refs/heads/*:refs/heads/*
		fetch = +refs/heads/*:refs/remotes/ptx/ukl/*

	[remote "ptx/otheruser"]
		url = git://git.pengutronix.de/git/otheruser/linux-2.6.git
		fetch = +refs/heads/*:refs/remotes/ptx/otheruser/*

	[remote "ptx/yetanotheruser"]
		url = git://git.pengutronix.de/git/yetanotheruser/linux-2.6.git
		fetch = +refs/heads/*:refs/remotes/ptx/yetanotheruser/*

unfortunately this makes sending request pulls uncomfortable:

	ukl@octopus:~/gsrc/linux-2.6$ git request-pull HEAD^ ptx/ukl
	The following changes since commit a08948812b30653eb2c536ae613b635a989feb6f:

	  Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging (2011-01-10 08:57:46 -0800)

	are available in the git repository at:

	  ptx/ukl mxs/for-2.6.38
	...

The reason for that is in git-parse-remote.sh:get_data_source() which assumes that a remote with a slash is a filename and so get_remote_url doesn't use $(git config --get "remote.$1.url") but ptx/ukl directly.

Best regards Uwe