qemu: Fix virQEMUCapsFindTarget on ppc64le

virQEMUCapsFindTarget is supposed to find an alternative QEMU binary if
qemu-system-$GUEST_ARCH doesn't exist. The alternative is using host
architecture when it is compatible with $GUEST_ARCH. But a special
treatment has to be applied for ppc64le since the QEMU binary is always
called qemu-system-ppc64.

Broken by me in v2.2.0-171-gf2e71550.

https://bugzilla.redhat.com/show_bug.cgi?id=1403745Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_capabilities.c

@@ -482,13 +482,13 @@ static virArch
 virQEMUCapsFindTarget(virArch hostarch,
                       virArch guestarch)
 {
+    if (virQEMUCapsGuestIsNative(hostarch, guestarch))
+        guestarch = hostarch;
+
     /* Both ppc64 and ppc64le guests can use the ppc64 target */
     if (ARCH_IS_PPC64(guestarch))
         guestarch = VIR_ARCH_PPC64;
 
-    if (virQEMUCapsGuestIsNative(hostarch, guestarch))
-        guestarch = hostarch;
-
     return guestarch;
 }