edje_cc - use mem_alloc to fail and exit if alloc fails and fix err out

edje_cc - use mem_alloc to fail and exit if alloc fails and fix err out

PVS sudio thought this was odd and it was a bit. not a real issue as a
mem alloc failure herw would still be fatal and simply a crash... as
opposed to a clean "out of mem" and fatal exit then...

error out eally was not finding originally allocated color and the
malloc should have been a mem_alloc() that guarantees a valid memory
return (or termintion of the process).

@fix