[ardb:efi-libstub-native-utf16 7/9] drivers/firmware/efi/libstub/vsprintf.c:251:5: warning: no previous prototype for 'efi_vsnprintf'

[ardb:efi-libstub-native-utf16 7/9] drivers/firmware/efi/libstub/vsprintf.c:251:5: warning: no previous prototype for 'efi_vsnprintf'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git efi-libstub-native-utf16
head:   c23f326a96b5293512720f389c597f967132c334
commit: b556b4a52f0a9b57d906dbb3bd63cebe6159e3e7 [7/9] efi/libstub: Output UTF-16 directly from vsnprintf()
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20260908/202609080354.G5E92knX-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260908/202609080354.G5E92knX-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609080354.G5E92knX-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/firmware/efi/libstub/vsprintf.c:251:5: warning: no previous prototype for 'efi_vsnprintf' [-Wmissing-prototypes]
     251 | int efi_vsnprintf(efi_char16_t *buf, size_t size, const char *fmt, va_list ap,
         |     ^~~~~~~~~~~~~


vim +/efi_vsnprintf +251 drivers/firmware/efi/libstub/vsprintf.c

   250	
 > 251	int efi_vsnprintf(efi_char16_t *buf, size_t size, const char *fmt, va_list ap,

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