irqchip: mtk-sysirq: Make mtk_sysirq_of_init return error if ioremap fails
irqchip: mtk-sysirq: Make mtk_sysirq_of_init return error if ioremap fails

PTR_ERR(NULL) returns 0 so current code returns 0 if ioremap fails, fix it.

Signed-off-by: Axel Lin <b6ffd6973e972cb999e8e535ab74da7fee0c035f@ingics.com>
Reviewed-by: Matthias Brugger <28c780319e2c7f6db09304375fbd148f9c25d13f@gmail.com>
Cc: Yingjoe Chen <0fa4ef9e7c72646732a82dcdd6eaba77c29231b5@mediatek.com>
Cc: 5e79e1ef0b5c4de2c63e3682dac9c65da3e09228@lists.infradead.org <5e79e1ef0b5c4de2c63e3682dac9c65da3e09228@lists.infradead.org>
Cc: Jason Cooper <68c46a606457643eab92053c1c05574abb26f861@lakedaemon.net>
Link: 94c93c6d867cb5fe1ccc7216908f40f9dafc7497@ingics.com
Signed-off-by: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs