Merge pull request #21937 from Kumataro:4.x-fix-21911

* Fix warnings for clang15

* Fix warnings: Remove unnecessary code

* Fix warnings: Remove unnecessary code

modules/gapi/src/compiler/passes/exec.cpp

@@ -606,7 +606,9 @@ namespace
         MergeContext mc;
 
         bool there_was_a_merge = false;
+#ifdef DEBUG_MERGE
         std::size_t iteration = 0u;
+#endif
         do
         {
             there_was_a_merge = false;
@@ -615,8 +617,8 @@ namespace
 #ifdef DEBUG_MERGE
             GAPI_LOG_INFO(NULL, "Before next merge attempt " << iteration << "...");
             merge_debug(g, iteration);
-#endif
             iteration++;
+#endif
             auto sorted = pass_helpers::topoSort(im);
             for (auto nh : sorted)
             {

modules/gapi/test/s11n/gapi_s11n_tests.cpp

@@ -569,7 +569,6 @@ TEST_F(S11N_Basic, Test_Bind_RunArgs_MatScalar) {
     v[0] = cv::GRunArg{ mat };
     v[1] = cv::GRunArg{ scalar };
     GRunArgsP output = cv::gapi::bind(v);
-    unsigned int i = 0;
     for (auto it : output)
     {
         using T = cv::GRunArgP;
@@ -591,7 +590,6 @@ TEST_F(S11N_Basic, Test_Bind_RunArgs_MatScalar) {
             GAPI_Assert(false && "This value type is not supported!"); // ...maybe because of STANDALONE mode.
             break;
         }
-        i++;
     }
 }