target/s390x: Fix broken user mode

Returning NULL from get_max_cpu_model results in a SIGSEGV runtime error.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170130131517.8092-1-sw@weilnetz.de>
Cc: qemu-stable@nongnu.org
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>

target/s390x/cpu_models.c

@@ -660,7 +660,6 @@ static void check_compatibility(const S390CPUModel *max_model,
 
 static S390CPUModel *get_max_cpu_model(Error **errp)
 {
-#ifndef CONFIG_USER_ONLY
     static S390CPUModel max_model;
     static bool cached;
 
@@ -680,7 +679,6 @@ static S390CPUModel *get_max_cpu_model(Error **errp)
         cached = true;
         return &max_model;
     }
-#endif
     return NULL;
 }