miscellaneous: clean up trailing whitespace once again

An earlier commit attempted to cleanse our environment
of all useless trailing whitespace. But the effort did
not catch 'empty' lines with a single space before ^J.

This commit hopefully finishes off the earlier effort.
In the meantime, let's pray that contributors' editors
are configured so that such wasted crap is disallowed!

Reference(s):
commit fe75e26ab6

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

proc/slab.c

@@ -146,7 +146,7 @@ static int parse_slabinfo20(struct slab_info **list, struct slab_stat *stats,
 
 		if (buffer[0] == '#')
 			continue;
-	
+
 		curr = get_slabnode();
 		if (!curr)
 			break;