Update posix.cfg

Author: chrchr-github

cfg/posix.cfg

@@ -2531,7 +2531,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <function name="munmap">
     <returnValue type="int"/>
     <noreturn>false</noreturn>
-    <arg nr="1" direction="in">
+    <arg nr="1" direction="in" indirect="0">
       <not-null/>
       <not-uninit/>
     </arg>