Comment's added and fixed.

Pointer's checked for NULL before access and after memory allocations.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11499 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellLevel1CommandsLib/Goto.c

@@ -33,6 +33,7 @@ ShellCommandRunGoto (
   SHELL_STATUS        ShellStatus;
   CHAR16              *CompareString;
   UINTN               Size;
+  SCRIPT_FILE         *CurrentScriptFile;
 
   ShellStatus         = SHELL_SUCCESS;
   CompareString       = NULL;
@@ -79,6 +80,7 @@ ShellCommandRunGoto (
       // Check forwards and then backwards for a label...
       //
       if (!MoveToTag(GetNextNode, L"endfor", L"for", CompareString, ShellCommandGetCurrentScriptFile(), FALSE, FALSE, TRUE)) {
+        CurrentScriptFile = ShellCommandGetCurrentScriptFile();
         ShellPrintHiiEx(
           -1, 
           -1, 
@@ -87,9 +89,9 @@ ShellCommandRunGoto (
           gShellLevel1HiiHandle, 
           CompareString, 
           L"Goto", 
-          ShellCommandGetCurrentScriptFile()!=NULL
-            &&ShellCommandGetCurrentScriptFile()->CurrentCommand!=NULL
-              ?ShellCommandGetCurrentScriptFile()->CurrentCommand->Line:0);
+          CurrentScriptFile!=NULL 
+            && CurrentScriptFile->CurrentCommand!=NULL
+            ? CurrentScriptFile->CurrentCommand->Line:0);
         ShellStatus = SHELL_NOT_FOUND;
       }
     FreePool(CompareString);