!6415 【bugfix】修复gs_increment_build部分内存泄漏点

Merge pull request !6415 from 周聪/bugfix_memecheck_gs_increment_build

src/bin/pg_rewind/fetch.cpp

@@ -396,10 +396,13 @@ static BuildErrorCode receiveFileChunks(const char* sql, FILE* file)
 
         switch (PQresultStatus(res)) {
             case PGRES_SINGLE_TUPLE:
+                PQclear(res);
+                res = nullptr;
                 break;
 
             case PGRES_TUPLES_OK:
                 PQclear(res);
+                res = nullptr;
                 continue; /* final zero-row result */
 
             default:
@@ -500,6 +503,8 @@ static BuildErrorCode receiveFileChunks(const char* sql, FILE* file)
             FetchCompressedFile(chunk, (uint32)chunkoff, (int32)chunkspace, (uint16)chunkSize, (uint8)algorithm);
         }
         PG_CHECKBUILD_AND_FREE_PGRESULT_RETURN(res);
+        PQclear(res);
+        res = nullptr;
     }
 
     g_progressFlag = true;

src/bin/pg_rewind/parsexlog.cpp

@@ -733,9 +733,11 @@ bool CheckIfEanbedSaveSlots()
         if ((strcmp(optvalue, "1") == 0) || (strcmp(optvalue, "true") == 0) || (strcmp(optvalue, "on") == 0)) {
             pg_log(PG_PROGRESS, _("Enable saving confirmed_lsn in target %s\n"), config_file);
             freefile(optlines);
+            optlines = nullptr;
             return true;
         }
     }
     freefile(optlines);
+    optlines = nullptr;
     return false;
 }