ShellPkg: Add checking for memory allocation and pointer returns from functions.

signed-off-by: jcarsey
reviewed-by: geekboy15a

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12540 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellDebug1CommandsLib/HexEdit/FileImage.c

@@ -178,6 +178,7 @@ HFileImageRead (
 
     StatusBarSetStatusString (UnicodeBuffer);
     FreePool (UnicodeBuffer);
+    return EFI_OUT_OF_RESOURCES;
   }
 
   HFileImageSetFileName (FileName);