qemu: Resolve Coverity FORWARD_NULL

Coverity points out it was possible to have a zero return from
qemuBuildRNGBackendProps thus not filling in 'props' and then
causing a NULL dereference on the next call.

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index c32d8c61d362294bd77f1515b44e3837c520412c..68844fa973a292515d36404d4489ec7581b69338 100644 (file)
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6464,7 +6464,9 @@ qemuBuildRNGBackendProps(virDomainRNGDefPtr rng,
         break;
 
     case VIR_DOMAIN_RNG_BACKEND_LAST:
-        break;
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("unknown rng-random backend"));
+        goto cleanup;
     }
 
     ret = 0;