Don't crap into descriptor table in binfmt_som

Same story as in binfmt_elf, except that in binfmt_som we
actually forget to close the sucker.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/binfmt_som.c

@@ -188,7 +188,6 @@ static int map_som_binary(struct file *file,
 static int
 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 {
-	int som_exec_fileno;
 	int retval;
 	unsigned int size;
 	unsigned long som_entry;
@@ -220,12 +219,6 @@ load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 		goto out_free;
 	}
 
-	retval = get_unused_fd();
-	if (retval < 0)
-		goto out_free;
-	get_file(bprm->file);
-	fd_install(som_exec_fileno = retval, bprm->file);
-
 	/* Flush all traces of the currently running executable */
 	retval = flush_old_exec(bprm);
 	if (retval)