media: pwc-ctl: pChoose can't be NULL

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+samsung@kernel.org>

1 files 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 */