lib: s390x: uv: Fix share return value and print

Let's only return 0/1 for success/failure respectively.
If needed we can later add rc/rrc pointers so we can check for the
reasons of cc==1 cases like we do in the kernel.

As share() might also be used in snippets it's best not to use prints
to avoid linking problems so lets remove the report_info().

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>