[PATCH] no need for checking it

[Figo.zhang]

vfree() does it's own NULL checking,so no need for check before
calling it.

Signed-off-by: Figo.zhang <figo1802@xxxxxxxxx>
---  
 drivers/staging/comedi/drivers.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/comedi/drivers.c
b/drivers/staging/comedi/drivers.c
index 6e13e45..ce50e85 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -495,9 +495,9 @@ int comedi_buf_alloc(struct comedi_device *dev,
struct comedi_subdevice *s,
 				vmap(pages, n_pages, VM_MAP,
 				PAGE_KERNEL_NOCACHE);
 		}
-		if (pages) {
-			vfree(pages);
-		}
+		vfree(pages);
+		pages = NULL;
+		
 		if (async->prealloc_buf == NULL) {
 			/* Some allocation failed above. */
 			if (async->buf_page_list) {


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