Remove non-initial tabs from sources

This commit was generated using the following script:

    git ls-tree -r --name-only HEAD \
        | egrep '[.](cc|c|h|in)$' \
        | grep -v 'mfs[.]cgi[.]in' \
        | xargs -IXX bash -c 'expand "XX" | unexpand --first-only > /tmp/conv && cat /tmp/conv > "XX"'

There are no other changes in this commit. All non-initial tabs were
removed from source code as this will be one of the requirements checked
by the automated test of code formatting.

Change-Id: Ic66ce2194c721acf2f0d1955a081098ff9467beb