[PATCH] util: clang is failing due to unused variables.

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After some recent patches, clang is throwing some errors related to
unused variables. This is not happening when we use GCC with -Werror
enabled. Only clang reports this warning.

make[3]: Entering directory '/home/julio/Desktop/virt/libvirt/src'
  CC       util/libvirt_util_la-virscsivhost.lo
  CC       util/libvirt_util_la-virusb.lo
  CC       util/libvirt_util_la-virmdev.lo
util/virmdev.c:373:36: error: unused variable 'ret' [-Werror,-Wunused-variable]
    VIR_AUTOPTR(virMediatedDevice) ret = virMediatedDeviceListSteal(list, dev);
                                   ^
1 error generated.
Makefile:11579: recipe for target 'util/libvirt_util_la-virmdev.lo' failed
make[3]: *** [util/libvirt_util_la-virmdev.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
util/virscsivhost.c:112:37: error: unused variable 'tmp' [-Werror,-Wunused-variable]
    VIR_AUTOPTR(virSCSIVHostDevice) tmp = virSCSIVHostDeviceListSteal(list, dev);
                                    ^
1 error generated.
Makefile:11411: recipe for target 'util/libvirt_util_la-virscsivhost.lo' failed
make[3]: *** [util/libvirt_util_la-virscsivhost.lo] Error 1
util/virusb.c:511:31: error: unused variable 'ret' [-Werror,-Wunused-variable]
    VIR_AUTOPTR(virUSBDevice) ret = virUSBDeviceListSteal(list, dev);

Signed-off-by: Julio Faracco <jcfaracco@xxxxxxxxx>
---
 src/util/virmdev.c      | 3 ++-
 src/util/virscsivhost.c | 3 ++-
 src/util/virusb.c       | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/util/virmdev.c b/src/util/virmdev.c
index 4050835cc1..63df4e40d8 100644
--- a/src/util/virmdev.c
+++ b/src/util/virmdev.c
@@ -370,7 +370,8 @@ void
 virMediatedDeviceListDel(virMediatedDeviceListPtr list,
                          virMediatedDevicePtr dev)
 {
-    VIR_AUTOPTR(virMediatedDevice) ret = virMediatedDeviceListSteal(list, dev);
+    VIR_AUTOPTR(virMediatedDevice) ret ATTRIBUTE_UNUSED
+            = virMediatedDeviceListSteal(list, dev);
 }
 
 
diff --git a/src/util/virscsivhost.c b/src/util/virscsivhost.c
index 280d0dc2fd..e07cd46ba9 100644
--- a/src/util/virscsivhost.c
+++ b/src/util/virscsivhost.c
@@ -109,7 +109,8 @@ void
 virSCSIVHostDeviceListDel(virSCSIVHostDeviceListPtr list,
                           virSCSIVHostDevicePtr dev)
 {
-    VIR_AUTOPTR(virSCSIVHostDevice) tmp = virSCSIVHostDeviceListSteal(list, dev);
+    VIR_AUTOPTR(virSCSIVHostDevice) tmp ATTRIBUTE_UNUSED
+            = virSCSIVHostDeviceListSteal(list, dev);
 }
 
 
diff --git a/src/util/virusb.c b/src/util/virusb.c
index 609d54836f..73a1041097 100644
--- a/src/util/virusb.c
+++ b/src/util/virusb.c
@@ -508,7 +508,8 @@ void
 virUSBDeviceListDel(virUSBDeviceListPtr list,
                     virUSBDevicePtr dev)
 {
-    VIR_AUTOPTR(virUSBDevice) ret = virUSBDeviceListSteal(list, dev);
+    VIR_AUTOPTR(virUSBDevice) ret ATTRIBUTE_UNUSED
+            = virUSBDeviceListSteal(list, dev);
 }
 
 virUSBDevicePtr
-- 
2.17.1

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