check if error is AlreadyExists before checking if the directory was created

Co-authored-by: Tobias Bucher <[email protected]>

Author: asder8215

library/std/src/fs.rs

@@ -3358,7 +3358,7 @@ impl DirBuilder {
         uncreated_dirs.extend(ancestors.take(uncreated_dir_ctr));
 
         for uncreated_dir in uncreated_dirs.iter().rev() {
-            if let Err(e) = self.inner.mkdir(uncreated_dir) {
+                if e.kind() != io::ErrorKind::AlreadyExists || !uncreated_dir.is_dir() {
                 if !uncreated_dir.is_dir() {
                     return Err(e);
                 }