spec: fix indentation fix

The RPM tags must not be indented.

Fixes: 6b8ab20fSigned-off-by: NJán Tomko <jtomko@redhat.com>

libvirt.spec.in

@@ -336,11 +336,11 @@ BuildRequires: device-mapper-devel
 BuildRequires: xfsprogs-devel
 %if %{with_storage_rbd}
     %if 0%{?fedora} || 0%{?rhel} > 7
-        BuildRequires: librados-devel
-        BuildRequires: librbd-devel
+BuildRequires: librados-devel
+BuildRequires: librbd-devel
     %else
-        BuildRequires: librados2-devel
-        BuildRequires: librbd1-devel
+BuildRequires: librados2-devel
+BuildRequires: librbd1-devel
     %endif
 %endif
 %if %{with_storage_gluster}