MIPS: ralink: fix return value check in rt_timer_probe()
MIPS: ralink: fix return value check in rt_timer_probe()

In case of error, the function devm_request_and_ioremap() returns NULL
pointer not ERR_PTR(). Fix it by using devm_ioremap_resource() instead
of devm_request_and_ioremap().

Signed-off-by: Wei Yongjun <b8f9cab8be13de37b9588aedad10a20fc3a68783@trendmicro.com.cn>
Acked-by: John Crispin <be6487f9df4dce44a640672d6c07330104d43593@openwrt.org>
Cc: 9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@linaro.org
Cc: aa00819e304141d872f2e4b1c4be422ea3abbfe1@calxeda.com
Cc: 562397917b9a8bf316569a848858b12fb417723f@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6098/
Signed-off-by: Ralf Baechle <92f48d309cda194c8eda36aa8f9ae28c488fa208@linux-mips.org>

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