[PATCH] media: atomisp: fix `-Werror=return-type`

[Ammar Faizi <ammar.faizi@xxxxxxxxxxxxxxxxxxxxx>]

Bedirhan reported build error:
```
  drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: In function ‘input_system_configure_channel_sensor’:
  drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c:1649:1: error: control reaches end of non-void function [-Werror=return-type]
   1649 | }
        | ^
  cc1: some warnings being treated as errors
  make[4]: *** [scripts/Makefile.build:277: drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.o] Error 1
  make[3]: *** [scripts/Makefile.build:540: drivers/staging/media/atomisp] Error 2
  make[2]: *** [scripts/Makefile.build:540: drivers/staging/media] Error 2
  make[1]: *** [scripts/Makefile.build:540: drivers/staging] Error 2
  make: *** [Makefile:1868: drivers] Error 2
```

Commit 264f590899146baa19e0ab5689e55fadbc292333 ("media: atomisp:
remove useless returns") incorrectly removed a required return results
in the above build error. Reinstate it.

Cc: Pavel Skripkin <paskripkin@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: linux-staging@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Reported-by: Bedirhan KURT <windowz414@xxxxxxxxxxx>
Fixes: 264f590899146baa19e0ab5689e55fadbc292333 ("media: atomisp: remove useless returns")
Signed-off-by: Ammar Faizi <ammar.faizi@xxxxxxxxxxxxxxxxxxxxx>
---
 .../media/atomisp/pci/hive_isp_css_common/host/input_system.c    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c b/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c
index 8e085dda0c18..1bd917e81743 100644
--- a/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c
+++ b/drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c
@@ -1646,6 +1646,7 @@ static input_system_err_t input_system_configure_channel_sensor(
 	default:
 		return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
 	}
+	return INPUT_SYSTEM_ERR_NO_ERROR;
 }
 
 // Test flags and set structure.
-- 
2.30.2