[PATCH 0/3] fix error return code

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These patches fix cases where the return code appears to be unintentially
nonnegative.

The complete semantic match that finds the problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret,l;
expression e1,e2,e3;
statement S;
@@

if (ret < 0)
 { ... return ret; }
... when != ret = e1
    when forall
(
 goto l;
|
 return ...;
|
 if (<+... ret = e3 ...+>) S
|
*if(...)
 {
  ... when != ret = e2
* return ret;
}
)
// </smpl>

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