[POWERPC] cell: Fix errno for modular spufs_create with invalid neighbour

At present, spu_create with an invalid neighbo(u)r will return -ENOSYS,
not -EBADF, but only when spufs.o is built as a module.

This change adds the appropriate errno, making the behaviour the same
as the built-in case.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/spu_syscalls.c

@@ -45,6 +45,7 @@ asmlinkage long sys_spu_create(const char __user *name,
 	if (owner && try_module_get(owner)) {
 		if (flags & SPU_CREATE_AFFINITY_SPU) {
 			neighbor = fget_light(neighbor_fd, &fput_needed);
+			ret = -EBADF;
 			if (neighbor) {
 				ret = spufs_calls.create_thread(name, flags,
 								mode, neighbor);