cadence_uart: Fix buffer overflow

Report from smatch:
hw/cadence_uart.c:413 uart_read(13) error: buffer overflow 's->r' 18 <= 18

This fixes read access to s->r[R_MAX] which is behind the limits of

cadence_uart: Fix buffer overflow

Report from smatch:
hw/cadence_uart.c:413 uart_read(13) error: buffer overflow 's->r' 18 <= 18

This fixes read access to s->r[R_MAX] which is behind the limits of s->r.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>

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cadence_uart: initial version of device model

Implemented cadence UART serial controller

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Signed-off-by: John Linn <john.linn

cadence_uart: initial version of device model

Implemented cadence UART serial controller

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Signed-off-by: John Linn <john.linn@xilinx.com>
Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

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