[S390] sclp: Test facility list before executing a service call.
Check if a command is available before executing. Saves some superfluous service calls that won't succeed anyway. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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