fuse: decode MKNOD result in debug output

MKNOD returns an EntryOut that we can decode.

Before:

20:27:39.722507 rx 24914: MKNOD n1 {010644 (022), 0} ["pipe"] 5b
20:27:39.722546 tx 24914:     OK

After:

20: 32:39.156352 rx 38: MKNOD n1 {010644 (022), 0} ["pipe"] 5b
20: 32:39.156389 tx 38:     OK, {n3 g1 tE=1s tA=1s {M010644 SZ=0 L=1 1027:1027 B0*4096 i0:46906 A 1641756759.155157 M 1641756759.155157 C 1641756759.155157}}
Change-Id: If40e690219f20459466d7c8f9aa822c7186179dc

fuse/opcode.go

@@ -736,6 +736,7 @@ func init() {
 		_OP_SETATTR:               func(ptr unsafe.Pointer) interface{} { return (*AttrOut)(ptr) },
 		_OP_INIT:                  func(ptr unsafe.Pointer) interface{} { return (*InitOut)(ptr) },
 		_OP_MKDIR:                 func(ptr unsafe.Pointer) interface{} { return (*EntryOut)(ptr) },
+		_OP_MKNOD:                 func(ptr unsafe.Pointer) interface{} { return (*EntryOut)(ptr) },
 		_OP_NOTIFY_INVAL_ENTRY:    func(ptr unsafe.Pointer) interface{} { return (*NotifyInvalEntryOut)(ptr) },
 		_OP_NOTIFY_INVAL_INODE:    func(ptr unsafe.Pointer) interface{} { return (*NotifyInvalInodeOut)(ptr) },
 		_OP_NOTIFY_STORE_CACHE:    func(ptr unsafe.Pointer) interface{} { return (*NotifyStoreOut)(ptr) },