TTY: serial, handle platform_get_irq retval properly

platform_get_irq can fail, so we should handle negative value when
returned.

[v2]

platform_get_irq can actually return zero on some platforms. So do not
remove checks for irq == 0 there.

Signed-off-by: Jiri Slaby <[email protected]>
Cc: Russell King <[email protected]>
Cc: "Uwe Kleine-König" <[email protected]>
Cc: Russell King <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Laxman Dewangan <[email protected]>
Cc: Stephen Warren <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Alexandre Courbot <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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