fix for libpthread

[David Xu]

Alfred Perlstein wrote:

>This assertion doesn't seem necessary.  Apply to 
>src/lib/libpthread/thread/thr_spinlock.c
>
>
>cvs server: Diffing .
>Index: thr_spinlock.c
>===================================================================
>RCS file: /home/ncvs/src/lib/libpthread/thread/thr_spinlock.c,v
>retrieving revision 1.21
>diff -u -r1.21 thr_spinlock.c
>--- thr_spinlock.c	9 Dec 2003 02:37:40 -0000	1.21
>+++ thr_spinlock.c	3 Mar 2004 06:10:25 -0000
>@@ -79,8 +79,6 @@
> {
> 	struct spinlock_extra *extra;
> 
>-	if (!__isthreaded)
>-		PANIC("Spinlock called when not threaded.");
> 	if (!initialized)
> 		PANIC("Spinlocks not initialized.");
> 	/*
>  
>
As I saw some reports in the -CURRENT list,  the panic is always 
triggered by mix up
of libc_r and libpthread in same program. So to avoid other mysterious 
crashes,
I'd like keep the code there, it is now used to check the problem.

David Xu