xfs_fsr: Fix parentheses around truth value

Someone in the distant past must have responded to gcc's warning about parentheses around assignment used as a truth value by changing:

	while (ret = func() == 0)
to:
	while ((ret = func() == 0))

While this shuts up gcc, it doesn't yield the proper result. If func () returns 0, func == 0 is true, and ret is assigned a value of 1.

This does keep the while loop going, but it's a very strange way to go about it, and may someday yield confusing results.

Fix this as:

	while ((ret = func()) == 0)

so that ret gets the function return value as expected.

---

index b46ad1f..b384565 100644
@@ -716,7 +716,7 @@ fsrfs(char *mntdir, xfs_ino_t startino, int targetrange)
 	tmp_init(mntdir);
 
 	while ((ret = xfs_bulkstat(fsfd,
-				&lastino, GRABSZ, &buf[0], &buflenout) == 0)) {
+				&lastino, GRABSZ, &buf[0], &buflenout)) == 0) {
 		xfs_bstat_t *p;
 		xfs_bstat_t *endp;
 

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Looks good,

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