Clean up load_elf_binary unwind code (1)

To prevent from reusing a deallocated files struct in load_elf_binary(),
simplify the function's unwind code. Bailing out to the unwind code
below the `point of no return' would be incorrect without this.

Index: linux-2.4.22-rc2.orig/fs/binfmt_elf.c
===================================================================
--- linux-2.4.22-rc2.orig.orig/fs/binfmt_elf.c	2003-08-09 01:52:16.000000000 +0200
+++ linux-2.4.22-rc2.orig/fs/binfmt_elf.c	2003-08-09 01:52:46.000000000 +0200
@@ -604,6 +604,7 @@ static int load_elf_binary(struct linux_
 	/* Discard our unneeded old files struct */
 	steal_locks(files);
 	put_files_struct(files);
+	files = NULL;
 
 	/* OK, This is the point of no return */
 	current->mm->start_data = 0;
@@ -811,9 +812,11 @@ out_free_interp:
 out_free_file:
 	sys_close(elf_exec_fileno);
 out_free_fh:
-	ftmp = current->files;
-	current->files = files;
-	put_files_struct(ftmp);
+	if (files) {
+		ftmp = current->files;
+		current->files = files;
+		put_files_struct(ftmp);
+	}
 out_free_ph:
 	kfree(elf_phdata);
 	goto out;