[S390] s390dbf: Remove needless check for NULL pointer.

The check for NULL pointer has already be done before. Therefore we can remove
the second check.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/debug.c

@@ -642,7 +642,6 @@ debug_open(struct inode *inode, struct file *file)
 	p_info = kmalloc(sizeof(file_private_info_t),
 						GFP_KERNEL);
 	if(!p_info){
-		if(debug_info_snapshot)
 		debug_info_free(debug_info_snapshot);
 		rc = -ENOMEM;
 		goto out;