media: dvb-frontends/drxk_hard.c: fix uninitialized variable warning

drxk_hard.c: In function 'hi_command.constprop':
drxk_hard.c:1016:5: warning: 'wait_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1015 |   } while ((status < 0) && (retry_count < DRXK_MAX_RETRIES)
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1016 |     && (wait_cmd != 0));
      |     ^~~~~~~~~~~~~~~~~~

The underlying cause is that the while condition is wrong. It should be:

(status < 0 || wait_cmd) && (retry_count < DRXK_MAX_RETRIES)

'wait_cmd' is only valid if '!(status < 0)'.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Author: Hans Verkuil

drivers/media/dvb-frontends/drxk_hard.c

@@ -1011,8 +1011,7 @@ static int hi_command(struct drxk_state *state, u16 cmd, u16 *p_result)
 			retry_count += 1;
 			status = read16(state, SIO_HI_RA_RAM_CMD__A,
 					  &wait_cmd);
-		} while ((status < 0) && (retry_count < DRXK_MAX_RETRIES)
-			 && (wait_cmd != 0));
+		} while ((status < 0 || wait_cmd) && (retry_count < DRXK_MAX_RETRIES));
 		if (status < 0)
 			goto error;
 		status = read16(state, SIO_HI_RA_RAM_RES__A, p_result);