revert hotplug malloc change

[Ted Unangst]

keeping a little bit of the change, i'm leaving the element expansion in 
there.  that's what i was really after the first time anyway.

Index: hotplug.c
===================================================================
RCS file: /home/tedu/cvs/src/sys/dev/hotplug.c,v
retrieving revision 1.10
diff -u -r1.10 hotplug.c
--- hotplug.c   2 Dec 2010 04:12:35 -0000       1.10
+++ hotplug.c   14 Dec 2010 03:59:10 -0000
@@ -26,14 +26,13 @@
 #include <sys/fcntl.h>
 #include <sys/hotplug.h>
 #include <sys/ioctl.h>
-#include <sys/malloc.h>
 #include <sys/poll.h>
 #include <sys/vnode.h>
 
 #define HOTPLUG_MAXEVENTS      64
 
 static int opened;
-static struct hotplug_event *evqueue;
+static struct hotplug_event evqueue[HOTPLUG_MAXEVENTS];
 static int evqueue_head, evqueue_tail, evqueue_count;
 static struct selinfo hotplug_sel;
 
@@ -89,8 +88,6 @@
                printf("hotplug: event lost, queue full\n");
                return (1);
        }
-       if (!evqueue)
-               return (1);
 
        evqueue[evqueue_head] = *he;
        evqueue_head = EVQUEUE_NEXT(evqueue_head);
@@ -122,22 +119,12 @@
 int
 hotplugopen(dev_t dev, int flag, int mode, struct proc *p)
 {
-       struct hotplug_event *q;
-
        if (minor(dev) != 0)
                return (ENXIO);
        if ((flag & FWRITE))
                return (EPERM);
        if (opened)
                return (EBUSY);
-       if (!evqueue) {
-               q = malloc(sizeof(*q) * HOTPLUG_MAXEVENTS, M_DEVBUF, M_WAITOK);
-               if (opened) {
-                       free(q, M_DEVBUF);
-                       return (EBUSY);
-               }
-               evqueue = q;
-       }
        opened = 1;
        return (0);
 }