Oops. Broke the build when I rearranged proc.c

defs.h

@@ -101,6 +101,7 @@ int             kill(int);
 void            pinit(void);
 void            procdump(void);
 void            scheduler(void) __attribute__((noreturn));
+void            sched(void);
 void            sleep(void*, struct spinlock*);
 void            userinit(void);
 int             wait(void);

proc.c

@@ -17,6 +17,8 @@ int nextpid = 1;
 extern void forkret(void);
 extern void trapret(void);
 
+static void wakeup1(void *chan);
+
 void
 pinit(void)
 {