Avoid rereading the superblock in bfree

The superblock is read when the first process returns to userspace (via the call to `iinit` from the first invocation of `forkret`, when `first` is still set to 1) and cached in a global; it is treated as immutable from that point on. There is no reason to re-read it in bfree. Removing this call seems to have simply been missed in 8320d61b when this general area was last touched. Remove it now to avoid potential confusion. Signed-off-by: Dan Cross <cross@gajendra.net>

Avoid rereading the superblock in bfree
82638c01 · Dan Cross · Frans Kaashoek · 0581c37b · 82638c01
--- a/fs.c
+++ b/fs.c
@@ -84,7 +84,6 @@ bfree(int dev, uint b)
  struct buf *bp;
  int bi, m;
-  readsb(dev, &sb);
  bp = bread(dev, BBLOCK(b, sb));
  bi = b % BPB;
  m = 1 << (bi % 8);