ivshmem: use common is_power_of_2()

The common version correctly checks for 0 value case.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>

hw/misc/ivshmem.c

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index fbb6f40..e678b18 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -117,10 +117,6 @@
     return (ivs->features & (1 << feature));
 }
 
-static inline bool is_power_of_two(uint64_t x) {
-    return (x & (x - 1)) == 0;
-}
-
 /* accessing registers - based on rtl8139 */
 static void ivshmem_update_irq(IVShmemState *s)
 {
@@ -632,7 +628,7 @@
     }
 
     /* BARs must be a power of 2 */
-    if (!is_power_of_two(value)) {
+    if (!is_power_of_2(value)) {
         error_setg(errp, "size must be power of 2");
         return 0;
     }