* R0 = the previously allocated pollword for this client
* Registers preserved
Unregister a previously registered client
Interrupts: Interrupt status is undefined
Fast interrupts are enabled
Processor mode: Processor is in SVC mode
Re-entrancy: SWI is not re-entrant
Use: This call unregisters a previously registered client. The same pollword as returned by PsiFS_Register must be specified.
Related SWIs: PsiFS_Register
Related vectors: None
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