[S390] sclp: simplify vt220 cleanup logic
Fix a number of sclp_vt220 cleanup problems: * fix list_empty check after list_del() * mark init-only flag as __initdata * remove implicit dependency between slab_available() and num_pages * straighten multiple init handling (use init count) Signed-off-by: NPeter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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