pager_query() misses multi.line SELECT\tab\FROM\tab.. SQL-Strings

I've wondered why pager_query() returned me 41 results, when there were only 36 nodes in the table.

Reason: db_result in combination with a multi-line SQL string misses to match a query (see below) that contains tabs or newlines.
$query = "
SELECT
n.nid,
n.title,
n.uid,
n.type,
n.status,
n.created,
u.name AS username
FROM
{node} n
...
";

The attached patch properly checks for whitespace instead of space-character and matches also the above query.