[PATCH] fs/btrfs: Fix uninitialized variable

[Khaled ROMDHANI <khaledromdhani216@gmail.com>]

Fix the warning: variable 'zone' is used
uninitialized whenever '?:' condition is true.

Fix that by preventing the code to reach
the last assertion. If the variable 'mirror'
is invalid, the assertion fails and we return
immediately.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Khaled ROMDHANI <khaledromdhani216@gmail.com>
---
 fs/btrfs/zoned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 8250ab3f0868..23da9d8dc184 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -145,7 +145,7 @@ static inline u32 sb_zone_number(int shift, int mirror)
 	case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
 	default:
 		ASSERT((u32)mirror < 3);
-		break;
+		return 0;
 	}
 
 	ASSERT(zone <= U32_MAX);

base-commit: b5c294aac8a6164ddf38bfbdd1776091b4a1eeba
-- 
2.17.1