[PATCH 2/5] media: pwc-ctl: pChoose can't be NULL

[Mauro Carvalho Chehab]

The way the code works, compression will be a valid value (less or equal to 3)
on both set_video_mode_foo() calls at the beginning of the while() loop.

So, the value for pChoose can't be NULL.

Solves those smatch warnings:

        drivers/media/usb/pwc/pwc-ctrl.c: drivers/media/usb/pwc/pwc-ctrl.c:252 
set_video_mode_Timon() warn: variable dereferenced before check 'pChoose' (see 
line 248)
        drivers/media/usb/pwc/pwc-ctrl.c: drivers/media/usb/pwc/pwc-ctrl.c:302 
set_video_mode_Kiara() warn: variable dereferenced before check 'pChoose' (see 
line 298)

and simplifies the code a little bit.

Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
---
 drivers/media/usb/pwc/pwc-ctrl.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/media/usb/pwc/pwc-ctrl.c b/drivers/media/usb/pwc/pwc-ctrl.c
index 655cef39eb3d..b681a184ef87 100644
--- a/drivers/media/usb/pwc/pwc-ctrl.c
+++ b/drivers/media/usb/pwc/pwc-ctrl.c
@@ -242,14 +242,14 @@ static int set_video_mode_Timon(struct pwc_device *pdev, 
int size, int pixfmt,
        fps = (frames / 5) - 1;
 
        /* Find a supported framerate with progressively higher compression */
-       pChoose = NULL;
-       while (*compression <= 3) {
+       do {
                pChoose = &Timon_table[size][fps][*compression];
                if (pChoose->alternate != 0)
                        break;
                (*compression)++;
-       }
-       if (pChoose == NULL || pChoose->alternate == 0)
+       } while (*compression <= 3);
+
+       if (pChoose->alternate == 0)
                return -ENOENT; /* Not supported. */
 
        if (send_to_cam)
@@ -279,7 +279,7 @@ static int set_video_mode_Timon(struct pwc_device *pdev, 
int size, int pixfmt,
 static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt,
                                int frames, int *compression, int send_to_cam)
 {
-       const struct Kiara_table_entry *pChoose = NULL;
+       const struct Kiara_table_entry *pChoose;
        int fps, ret = 0;
 
        if (size >= PSZ_MAX || *compression < 0 || *compression > 3)
@@ -293,13 +293,14 @@ static int set_video_mode_Kiara(struct pwc_device *pdev, 
int size, int pixfmt,
        fps = (frames / 5) - 1;
 
        /* Find a supported framerate with progressively higher compression */
-       while (*compression <= 3) {
+       do {
                pChoose = &Kiara_table[size][fps][*compression];
                if (pChoose->alternate != 0)
                        break;
                (*compression)++;
-       }
-       if (pChoose == NULL || pChoose->alternate == 0)
+       } while (*compression <= 3);
+
+       if (pChoose->alternate == 0)
                return -ENOENT; /* Not supported. */
 
        /* Firmware bug: video endpoint is 5, but commands are sent to endpoint 
4 */
-- 
2.20.1