[initramfs] unpack_to_rootfs() should print error messages upon OOM.

[Tetsuo Handa]

I tried to install Fedora-15-i386-DVD.iso (which uses a 2.6.38 kernel) on a VM
with 512MB of RAM. The boot process stopped after printing

   Trying to unpack rootfs image as initramfs...

. The cause was RAM was not sufficient. It seems that Fedora 15 requires
more than 640MB of RAM to unpack the initramfs.

I think we should print error messages when unpacking the initramfs cannot be
completed due to insufficient RAM.
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