cpus: use first_cpu macro instead of QTAILQ_FIRST(&cpus)

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

cpus.c

diff --git a/cpus.c b/cpus.c
index e6dcae3..62d157a 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1016,7 +1016,7 @@
     qemu_cond_signal(&qemu_cpu_cond);
 
     /* wait for initial kick-off after machine start */
-    while (QTAILQ_FIRST(&cpus)->stopped) {
+    while (first_cpu->stopped) {
         qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
 
         /* process any pending work */