cloog_loop_separate: minor clean-ups
cloog_loop_separate: minor clean-ups

First, cloog_loop_separate would keep track of whether we were
dealing with the first loop in the list to reset some field
(inner) that was never used afterwards anyway.

Second, cloog_loop_separate would check whether any loop in the
list had a block different from NULL, but this can never happen
since it is always called on a list of loops created by
cloog_loop_project, which sets their blocks to NULL.

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

UBERTC/cloog,evaautomation/cloog,periscop/cloog,UBERTC/cloog,epowers/cloog,UBERTC/cloog,epowers/cloog,Distrotech/cloog,heysion/cloog-clone,Distrotech/cloog,SaberMod/cloog-current,evaautomation/cloog,SaberMod/cloog-current,VanirLLVM/toolchain_cloog,epowers/cloog,heysion/cloog-clone,cfx-next/toolchain_cloog-upstream,Syllo/cloog,VanirLLVM/toolchain_cloog,cfx-next/toolchain_cloog-upstream,VanirLLVM/toolchain_cloog,Distrotech/cloog,Syllo/cloog,heysion/cloog-clone,cfx-next/toolchain_cloog-upstream,periscop/cloog