Fix ItemStack load from NBT with short overflow

[slprime]

In some modpacks the item identifier may exceed the short: issue.txt

java.lang.NullPointerException: Updating screen events
	at codechicken.nei.NEIClientUtils.giveStack(NEIClientUtils.java:235)
	at codechicken.nei.NEIClientUtils.cheatItem(NEIClientUtils.java:229)
	at codechicken.nei.PanelWidget.mouseUp(PanelWidget.java:291)
	at codechicken.nei.LayoutManager.onMouseUp(LayoutManager.java:250)
	at codechicken.nei.guihook.GuiContainerManager.mouseUp(GuiContainerManager.java:555)
	at codechicken.nei.guihook.GuiContainerManager.overrideMouseUp(GuiContainerManager.java:548)
	at net.minecraft.client.gui.inventory.GuiContainer.func_146286_b(GuiContainer.java)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146286_b(GuiContainerCreative.java:462)
	at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
	at net.minecraft.client.gui.inventory.GuiContainer.func_146274_d(GuiContainer.java)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146274_d(GuiContainerCreative.java:566)
	at net.minecraft.client.gui.GuiScreen.redirect$bpj000$modularui2$modularui