media: rzg2l-cru: Remove unnecessary shadowing of ret in rzg2l_csi2_s_stream()

Clang warns:

drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:445:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (ret)
^~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:475:9: note: uninitialized use occurs here
return ret;
^~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:445:3: note: remove the 'if' if its condition is always false
if (ret)
^~~~~~~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:441:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (ret)
^~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:475:9: note: uninitialized use occurs here
return ret;
^~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:441:3: note: remove the 'if' if its condition is always false
if (ret)
^~~~~~~~
drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c:431:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
2 errors generated.

ret is unnecessarily shadowed, meaning the assignments to ret within the
first 'if (enable)' block are only applied to the inner scope, not the
outer one as intended. Remove the shadowing to fix the warnings and make
everything work correctly.

Link: https://github.com/ClangBuiltLinux/linux/issues/1764

Fixes: 51e8415e39a9 ("media: platform: Add Renesas RZ/G2L MIPI CSI-2 receiver driver")
Signed-off-by: Nathan Chancellor <[e-mail]>
Reviewed-by: Lad Prabhakar <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/renesas/rzg2l-cru/rzg2l-csi2.c

···
 	int ret;
 
 	if (enable) {
-		int ret;
-
 		ret = pm_runtime_resume_and_get(csi2->dev);
 		if (ret)
 			return ret;