isdn/isdn_common: replace

@@ -19,6 +19,7 @@
 #include <linux/vmalloc.h>
 #include <linux/isdn.h>
 #include <linux/smp_lock.h>
+#include <linux/wait.h>
 #include "isdn_common.h"
 #include "isdn_tty.h"
 #include "isdn_net.h"

@@ -1066,8 +1067,8 @@ isdn_write(struct file *file, const char
 			goto out;
 		}
 		chidx = isdn_minor2chan(minor);
-		while (isdn_writebuf_stub(drvidx, chidx, buf, count) != count)
-			interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
+		wait_event(dev->drv[drvidx]->snd_waitq[chidx],
+				(isdn_writebuf_stub(drvidx, chidx, buf, count) == count));
 		retval = count;
 		goto out;
 	}

@@ -19,6 +19,7 @@
 #include <linux/vmalloc.h>
 #include <linux/isdn.h>
 #include <linux/smp_lock.h>
+#include <linux/wait.h>
 #include "isdn_common.h"
 #include "isdn_tty.h"
 #include "isdn_net.h"

@@ -1066,8 +1067,8 @@ isdn_write(struct file *file, const char
 			goto out;
 		}
 		chidx = isdn_minor2chan(minor);
-		while (isdn_writebuf_stub(drvidx, chidx, buf, count) != count)
-			interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
+		wait_event(dev->drv[drvidx]->snd_waitq[chidx],
+				(isdn_writebuf_stub(drvidx, chidx, buf, count) == count));
 		retval = count;
 		goto out;
 	}