scatterlist: reorder compound boolean expression

Test the cheaper boolean expression with no side effects first.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Gilad Ben-Yossef <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

lib/scatterlist.c

@@ -666,7 +666,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
 
 	local_irq_save(flags);
 
-	while (sg_miter_next(&miter) && offset < buflen) {
+	while ((offset < buflen) && sg_miter_next(&miter)) {
 		unsigned int len;
 
 		len = min(miter.length, buflen - offset);