virbuffer: Set child buffer indent properly

There's this macro virBufferSetChildIndent which sets offset of
child buffer from given parent buffer. However, it is calling
virBufferAdjustIndent() which only adds adjustment instead of
calling virBufferSetIndent() which clears out any adjustment
previously set.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/util/virbuffer.h

@@ -112,7 +112,7 @@ void virBufferSetIndent(virBufferPtr, int indent);
  * child buffer.
  */
 # define virBufferSetChildIndent(childBuf_, parentBuf_) \
-    virBufferAdjustIndent(childBuf_, virBufferGetIndent(parentBuf_, false) + 2)
+    virBufferSetIndent(childBuf_, virBufferGetIndent(parentBuf_, false) + 2)
 
 int virBufferGetIndent(const virBuffer *buf, bool dynamic);