coccinelle: bool if (foo) return true; else return false;

[Joe Perches]

There's ~150 of these in the kernel.

Maybe there's use for this conversion to be added
to scripts/coccinelle/misc/boolreturn.cocci or in
a separate file.

$ cat booltruefalse.cocci
@@
identifier fn;
expression e;
typedef bool;
symbol true;
symbol false;
@@

bool fn ( ... )
{
<...
-       if (e) return true; else return false;
+       return e;
...>
}

@@
identifier fn;
expression e;
@@

bool fn ( ... )
{
<...
-       if (e) return false; else return true;
+       return !e;
...>
}