smb: client: get rid of kstrdup() when parsing domain mount option

Steal string reference from @param->string rather than duplicating it.

Signed-off-by: Paulo Alcantara (Red Hat) <[email protected]>
Reviewed-by: David Howells <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: pcacjr

fs/smb/client/fs_context.c

@@ -1512,11 +1512,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		}
 
 		kfree(ctx->domainname);
-		ctx->domainname = kstrdup(param->string, GFP_KERNEL);
-		if (ctx->domainname == NULL) {
-			cifs_errorf(fc, "OOM when copying domainname string\n");
-			goto cifs_parse_mount_err;
-		}
+		ctx->domainname = no_free_ptr(param->string);
 		cifs_dbg(FYI, "Domain name set\n");
 		break;
 	case Opt_srcaddr: