misc: remove some trailing whitespace newly introduced

The commit (merge) referenced below added some useless
trailing whitespace, and this patch will correct such.

[ this also updates the NEWS file for the buglet fix ]

Gosh, if folks cannot coax their editors into avoiding
such crap they should remove the '.sample' suffix from
their '.git/hooks/pre-commit.sample' file. Thereafter,
git itself will reject changes with whitespace errors.

Reference(s):
commit cc1f49aeba

Signed-off-by: Jim Warner <james.warner@comcast.net>

proc/wchan.c

@@ -47,6 +47,6 @@ const char * lookup_wchan (int pid) {
    // lame ppc64 has a '.' in front of every name
    if (*ret=='.') ret++;
    while(*ret=='_') ret++;
-   
+
    return ret;
 }