Please discard "checkpatch: warn when using extern with function prototypes in .h files"

[David Howells]

I noticed that a patch got committed to checkpatch to complain about function
prototypes prefixed by "extern".

Please discard/revert this patch:

	commit 7cd0f806622836e386ef18ad1950a9a729803019
	Author: Joe Perches <joe@xxxxxxxxxxx>
	Date:   Wed Aug 28 10:16:00 2013 +1000
	checkpatch: warn when using extern with function prototypes in .h files

	Using the extern keyword on function prototypes is superfluous visual
	noise so suggest removing it.

This is inaccurate.  It's actually a useful visual cue - so if anything, please
make checkpatch indicate that it be added to all future function prototypes.

David
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