tree 327212154350ab031cbd64e39c8ef93cbd9bb6b5
parent c12c360f89d4d1cc0a0ad80c4ea0785f84be1848
author Shawn O. Pearce <sop@google.com> 1240025564 -0700
committer Shawn O. Pearce <sop@google.com> 1240027425 -0700

Avoid unnecessary git symbolic-ref calls during repo sync

If the m/BRANCH ref is already pointing at the value set in the
manifest there is no reason to set it again.  Leave it alone,
thus saving a full fork+exec call.

Signed-off-by: Shawn O. Pearce <sop@google.com>