build: fix whitespace damage

Introduced in commit 1f8c33b6.

* src/lxc/lxc_container.c (lxcContainerGetSubtree): Avoid TAB.

src/lxc/lxc_container.c

@@ -1048,7 +1048,7 @@ static int lxcContainerGetSubtree(const char *prefix,
             virReportOOMError();
             goto cleanup;
         }
-	nmounts++;
+        nmounts++;
         VIR_DEBUG("Grabbed %s", mntent.mnt_dir);
     }