odrefresh: don't stage profile if not exists

The code staged the file even if the open failed. This causes a null
pointer dereference later in JoinFilesAsFDs (only used in the
Compilaiton OS case).

Bug: 186132447
Test: odrefresh --use-compilation-os=10 --force-compile
      # complete successfully with other changes
Change-Id: I8227d863ea56e2a7071816130f6b354ac80d03ce
1 file changed