fts: Fix a potential memory leak in error case

fts: Fix a potential memory leak in error case

Dan Krejsa reports a potential memory leak in an fts_build error case,
detected by Coverity.  (It doesn't seem to show up in Coverity Scan, so I
don't have a CID to point to.)

I don't know whether it is actually possible to arrive in this case with a
non-empty 'head' list.  The cost is low, though.  One additional branch in a
terminal error case isn't the end of the world.

PR:		217125
Submitted by:	Dan Krejsa <dan.krejsa at gmail.com>