qemu: Don't initialize struct utsname

It breaks the build and it is not really useful for anything.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_capabilities.c

@@ -5431,7 +5431,7 @@ virQEMUCapsCacheNew(const char *libDir,
     char *capsCacheDir = NULL;
     virFileCachePtr cache = NULL;
     virQEMUCapsCachePrivPtr priv = NULL;
-    struct utsname uts = { 0 };
+    struct utsname uts;
 
     if (virAsprintf(&capsCacheDir, "%s/capabilities", cacheDir) < 0)
         goto error;