[PATCH v3] fs/btrfs: Fix uninitialized variable

[Khaled ROMDHANI]

As reported by the Coverity static analysis.
The variable zone is not initialized which
may causes a failed assertion.

Addresses-Coverity: ("Uninitialized variables")
Signed-off-by: Khaled ROMDHANI <khaledromdhani216@xxxxxxxxx>
---
v3: catch default as an assertion failure
as proposed by David Sterba.
---
 fs/btrfs/zoned.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 70b23a0d03b1..432509f4b3ac 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -143,6 +143,9 @@ static inline u32 sb_zone_number(int shift, int mirror)
 	case 0: zone = 0; break;
 	case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
 	case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
+	default:
+		ASSERT(zone);
+		break;
 	}
 
 	ASSERT(zone <= U32_MAX);
-- 
2.17.1