[PATCH 5/6] iomap: fix WARN_ON_ONCE on uninitialized variable

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

In commit 9dc55f1389f9569 ("iomap: add support for sub-pagesize buffered
I/O without buffer heads") we moved the initialization of poff (it's
computed from pos) into a separate helper function.  Inline data only
ever deals with pos == 0, hence the WARN_ON_ONCE, but now we're testing
an uninitialized variable.

Therefore, change the test to check the parameter directly.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/iomap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/fs/iomap.c b/fs/iomap.c
index 8bd54c08deee..8a18163dc432 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -290,7 +290,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 	sector_t sector;
 
 	if (iomap->type == IOMAP_INLINE) {
-		WARN_ON_ONCE(poff);
+		WARN_ON_ONCE(pos);
 		iomap_read_inline_data(inode, page, iomap);
 		return PAGE_SIZE;
 	}