api doc: fix two doxygen group closing braces

Change-Id: I6c1f47d13c5b7a9cb2281de9f017df4f1ed88ba7
diff --git a/include/osmocom/core/linuxlist.h b/include/osmocom/core/linuxlist.h
index cb753d1..8d0533f 100644
--- a/include/osmocom/core/linuxlist.h
+++ b/include/osmocom/core/linuxlist.h
@@ -397,5 +397,5 @@
 }
 
 /*!
- *  }@
+ *  @}
  */