Apply suggestions from code review

Co-authored-by: Geoffrey White <40627776+geoffw0@users.noreply.github.com>

Author: ihsinme

cpp/ql/src/experimental/Security/CWE/CWE-476/DangerousUseOfExceptionBlocks.cpp

@@ -1,6 +1,6 @@
 ...
 try {
-  if (chackValue) throw exception();
+  if (checkValue) throw exception();
   valData->bufMyData =  new myData*[valData->sizeInt];
 
   } 
@@ -13,7 +13,7 @@ try {
     }
 ...
 try {
-  if (chackValue) throw exception();
+  if (checkValue) throw exception();
   valData->bufMyData =  new myData*[valData->sizeInt];
 
   } 

cpp/ql/src/experimental/Security/CWE/CWE-476/DangerousUseOfExceptionBlocks.qhelp

@@ -3,7 +3,7 @@
   "qhelp.dtd">
 <qhelp>
 <overview>
-<p>When clearing the data in the catch block, you must be sure that the memory was allocated before the exception.</p>
+<p>When releasing memory in a catch block, be sure that the memory was allocated and has not already been released.</p>
 
 </overview>
 

cpp/ql/test/experimental/query-tests/Security/CWE/CWE-476/semmle/tests/test.cpp

@@ -151,7 +151,7 @@ void funcWork3() {
 
 void funcWork4() {
   int a;
-  myGlobalData *valData;
+  myGlobalData *valData = 0;
   try { 
 	valData = new myGlobalData;
 	cleanFunction();
@@ -167,7 +167,7 @@ void funcWork4() {
 
 void funcWork4b() {
   int a;
-  myGlobalData *valData;
+  myGlobalData *valData = 0;
   try { 
 	valData = new myGlobalData;
 	cleanFunction();
@@ -181,7 +181,7 @@ void funcWork4b() {
 }
 void funcWork5() {
   int a;
-  myGlobalData *valData;
+  myGlobalData *valData = 0;
   try { 
 	valData = new myGlobalData;
 	cleanFunction();
@@ -202,7 +202,7 @@ void funcWork5() {
 
 void funcWork5b() {
   int a;
-  myGlobalData *valData;
+  myGlobalData *valData = 0;
   try { 
 	valData = new myGlobalData;
 	cleanFunction();
@@ -220,7 +220,7 @@ void funcWork5b() {
 void funcWork6() {
   int a;
   int flagB = 0;
-  myGlobalData *valData;
+  myGlobalData *valData = 0;
   try { 
 	valData = new myGlobalData;
 	cleanFunction();