Removed unused `dirlookup` argument in `create`

The `off` argument to `dirlookup` is optional. It was not being used in the `dirlookup` call in `create`, so pass NULL instead and delete the unused local. Signed-off-by: Dan Cross <cross@gajendra.net>

Removed unused `dirlookup` argument in `create`
0581c37b · Dan Cross · Frans Kaashoek · b818915f · 0581c37b
--- a/sysfile.c
+++ b/sysfile.c
@@ -241,7 +241,6 @@ bad:
 static struct inode*
 create(char *path, short type, short major, short minor)
 {
-  uint off;
  struct inode *ip, *dp;
  char name[DIRSIZ];

@@ -249,7 +248,7 @@ create(char *path, short type, short major, short minor)
    return 0;
  ilock(dp);

-  if((ip = dirlookup(dp, name, &off)) != 0){
+  if((ip = dirlookup(dp, name, 0)) != 0){
    iunlockput(dp);
    ilock(ip);
    if(type == T_FILE && ip->type == T_FILE)