Fix a memory leak shown by valgrind

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Andreas Ericsson <ae@op5.se>

src/revobject.c

@@ -167,6 +167,7 @@ void git_revpool_table_free(git_revpool_table *table)
 		}
 	}
 
+	free(table->nodes);
 	free(table);
 }