irqdomain: Drop bogus fwspec-mapping error handling

In case a newly allocated IRQ ever ends up not having any associated
struct irq_data it would not even be possible to dispose the mapping.

Replace the bogus disposal with a WARN_ON().

This will also be used to fix a shared-interrupt mapping race, hence the
CC-stable tag.

Fixes: 1e2a7d78499e ("irqdomain: Don't set type when mapping an IRQ")
Cc: [email protected]      # 4.8
Tested-by: Hsin-Yi Wang <[email protected]>
Tested-by: Mark-PK Tsai <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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