DONTMERGE git-p4: "name-rev HEAD" is not a way to find the current branchjc/p4-current-branch-fix

This function seems to want to learn which branch we are on, and
running "name-rev HEAD" is *NEVER* the right way to do so.  If you
are on branch B which happens to point at the same commit as branch
A, "name-rev HEAD" can say either A or B (and it is likely it would
say A simply because it sorts earlier, and the logic seems to favor
the one that was discovered earlier when all else being equal).  If
you are on branch B which happens to be pointed by an annotated tag
T, "name-rev HEAD" will say T, not B.

Use "symbolic-ref HEAD" instead.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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