s390: Delete unnecessary checks before the function call "debug_unregister"

The debug_unregister() function performs also input parameter validation.
Thus the test around the calls is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/chsc_sch.c

@@ -185,7 +185,6 @@ static int __init chsc_init_dbfs(void)
 	debug_set_level(chsc_debug_log_id, 2);
 	return 0;
 out:
-	if (chsc_debug_msg_id)
 	debug_unregister(chsc_debug_msg_id);
 	return -ENOMEM;
 }

drivers/s390/cio/cio.c

@@ -76,11 +76,8 @@ static int __init cio_debug_init(void)
 	return 0;
 
 out_unregister:
-	if (cio_debug_msg_id)
 	debug_unregister(cio_debug_msg_id);
-	if (cio_debug_trace_id)
 	debug_unregister(cio_debug_trace_id);
-	if (cio_debug_crw_id)
 	debug_unregister(cio_debug_crw_id);
 	return -1;
 }

drivers/s390/cio/qdio_debug.c

@@ -366,8 +366,6 @@ void qdio_debug_exit(void)
 {
 	qdio_clear_dbf_list();
 	debugfs_remove(debugfs_root);
-	if (qdio_dbf_setup)
 	debug_unregister(qdio_dbf_setup);
-	if (qdio_dbf_error)
 	debug_unregister(qdio_dbf_error);
 }

drivers/s390/crypto/zcrypt_api.c

@@ -1428,9 +1428,7 @@ int __init zcrypt_debug_init(void)
 void zcrypt_debug_exit(void)
 {
 	debugfs_remove(debugfs_root);
-	if (zcrypt_dbf_common)
 	debug_unregister(zcrypt_dbf_common);
-	if (zcrypt_dbf_devices)
 	debug_unregister(zcrypt_dbf_devices);
 }