Fix uninitialized variables, and use -O so gcc starts checking for them

Gcc only sends warnings for uninitialized variables when you compile with -O,
and there were a couple of bugs sprinkled in the code.  The biggest was the
alloc_start variable for mkfs, which can cause strange things to happen.

(thanks to Gabor Micsko for helping to find this)

1 files changed, 1 insertions, 1 deletions

diff --git a/mkfs.c b/mkfs.c
index c02627f3..740cc81d 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -308,7 +308,7 @@ int main(int ac, char **av)
 	u64 block_count = 0;
 	u64 dev_block_count = 0;
 	u64 blocks[6];
-	u64 alloc_start;
+	u64 alloc_start = 0;
 	u64 metadata_profile = BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP;
 	u64 data_profile = BTRFS_BLOCK_GROUP_RAID0;
 	u32 leafsize = getpagesize();