Fix #2938 (#2976)

* Update sql-injection-analyzer.js

* cleanup

Author: simon-id

packages/datadog-instrumentations/src/pg.js

@@ -30,8 +30,9 @@ function wrapQuery (query) {
     const callbackResource = new AsyncResource('bound-anonymous-fn')
     const asyncResource = new AsyncResource('bound-anonymous-fn')
     const processId = this.processID
-    let pgQuery = {}
-    pgQuery.text = arguments[0]
+    let pgQuery = {
+      text: arguments[0]
+    }
 
     return asyncResource.runInAsyncScope(() => {
       startCh.publish({

packages/dd-trace/src/appsec/iast/analyzers/sql-injection-analyzer.js

@@ -6,7 +6,7 @@ class SqlInjectionAnalyzer extends InjectionAnalyzer {
     super('SQL_INJECTION')
     this.addSub('apm:mysql:query:start', ({ sql }) => this.analyze(sql))
     this.addSub('apm:mysql2:query:start', ({ sql }) => this.analyze(sql))
-    this.addSub('apm:pg:query:start', ({ originalQuery }) => this.analyze(originalQuery))
+    this.addSub('apm:pg:query:start', ({ query }) => this.analyze(query.text))
   }
 }