Clean up kernel/proc, remove devs_spinlock, remove PROC_DIE() macro

kernel/proc/proc.c

@@ -141,7 +141,6 @@ Proc *proc_spawnuser(char *mountpoint, char *path) {
   proc->pid = pids++;
   proc->mman_map_base = PROC_MMAN_MAP_BASE;
   spinlock_init(&proc->pipes_spinlock);
-  spinlock_init(&proc->devs_spinlock);
 
   proc->pipes[0] = dlmalloc(sizeof(IpcPipe));
   ipc_pipeinit(proc->pipes[0], proc->pid);

kernel/proc/proc.h

@@ -61,7 +61,6 @@ typedef struct Proc {
   SpinLock pipes_spinlock;
 
   Dev *devs[PROC_DEVHANDLES_MAX];
-  SpinLock devs_spinlock;
 
   struct {
     ProcArg *list;
@@ -88,13 +87,6 @@ void proc_sched(void *cpustate);
 void proc_killself(void);
 void proc_kill(Proc *proc);
 
-#define PROC_DIE() \
-  do { \
-    proc_killself(); \
-    for(;;); \
-  } while(0)
-
-
 #define PROC_ARG(proc, str) \
   do { \
     ProcArg *__arg = dlmalloc(sizeof(*__arg)); \