next-20251027: s390: pf1550-onkey.c:154:12: error: 'pf1550_onkey_resume' defined but not used [-Werror=unused-function]

[Naresh Kamboju]

The following S390 allyesconfig build regressions noticed on the
Linux next-20251027 tag with gcc-14.

* S390, build
  - gcc-14-allyesconfig

First seen on next-20251027
Good: next-20251024
Bad: next-20251027

Regression Analysis:
- New regression? yes
- Reproducibility? yes

Build regression: next-20251027: pf1550-onkey.c:154:12: error:
'pf1550_onkey_resume' defined but not used [-Werror=unused-function]

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

## Build error
drivers/input/misc/pf1550-onkey.c:154:12: error: 'pf1550_onkey_resume'
defined but not used [-Werror=unused-function]
  154 | static int pf1550_onkey_resume(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~
drivers/input/misc/pf1550-onkey.c:133:12: error:
'pf1550_onkey_suspend' defined but not used [-Werror=unused-function]
  133 | static int pf1550_onkey_suspend(struct device *dev)
      |            ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[6]: *** [/builds/linux/scripts/Makefile.build:287:
drivers/input/misc/pf1550-onkey.o] Error 1


## Source
* Kernel version: 6.18.0-rc2-next-20251027
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: next-20251027
* Git commit: 8fec172c82c2b5f6f8e47ab837c1dc91ee3d1b87
* Architectures: S390
* Toolchains: gcc-14
* Kconfigs: allyesconfig

## Build
* Test log:  https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrowtK5wNPnem1T5LSEjjq5o/build.log
* Test details:
https://regressions.linaro.org/lkft/linux-next-master/next-20251027/log-parser-build-kernel/gcc-compiler-_drivers_input_misc_pf-onkey_c_error_pf_onkey_resume_defined_but_not_used/
* Build plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/builds/34dKrowtK5wNPnem1T5LSEjjq5o
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrowtK5wNPnem1T5LSEjjq5o/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/34dKrowtK5wNPnem1T5LSEjjq5o/config

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Linaro LKFT