radv: Fix compilation with gcc-13 and tsan enabled

../src/amd/vulkan/radv_sampler.c: In function ‘radv_tex_wrap’:
../src/amd/vulkan/radv_sampler.c:50:1: error: control reaches end of non-void function [-Werror=return-type]
   50 | }
      | ^
../src/amd/vulkan/radv_sampler.c: In function ‘radv_tex_compare’:
../src/amd/vulkan/radv_sampler.c:76:1: error: control reaches end of non-void function [-Werror=return-type]
   76 | }
      | ^

Fixes: 4de305cb8a
   radv: move sampler related code to radv_sampler.c

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27345>
(cherry picked from commit ca47138fb1)

.pick_status.json

@@ -654,7 +654,7 @@
         "description": "radv: Fix compilation with gcc-13 and tsan enabled",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "4de305cb8a3c68df8e89f8c1359f510a1089cfd3",
         "notes": null

src/amd/vulkan/radv_sampler.c

@@ -47,6 +47,7 @@ radv_tex_wrap(VkSamplerAddressMode address_mode)
       unreachable("illegal tex wrap mode");
       break;
    }
+   return 0;
 }
 
 static unsigned
@@ -73,6 +74,7 @@ radv_tex_compare(VkCompareOp op)
       unreachable("illegal compare mode");
       break;
    }
+   return 0;
 }
 
 static unsigned