s390/hypfs_sprp: fix virtual vs physical address confusion

Add missing virt_to_phys() translation to __hypfs_sprp_diag304().
This doesn't fix a bug since virtual and physical addresses are
currently the same.
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/hypfs/hypfs_sprp.c

@@ -25,7 +25,7 @@
 
 static inline unsigned long __hypfs_sprp_diag304(void *data, unsigned long cmd)
 {
-	union register_pair r1 = { .even = (unsigned long)data, };
+	union register_pair r1 = { .even = virt_to_phys(data), };
 
 	asm volatile("diag %[r1],%[r3],0x304\n"
 		     : [r1] "+&d" (r1.pair)