Rename wait_irq to yield_toirq.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/src/clock.c b/src/clock.c
index c66c3f0..97d5301 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -612,7 +612,7 @@
         return;
     }
     while (!statusflag)
-        wait_irq();
+        yield_toirq();
     set_success(regs);
 }