Since we put static variable to a header file it's copied to each module
that includes the header. But not all of them are actually using it.

Mark nvmem_type_str array with __maybe_unused to make a compiler happy:

In file included from include/linux/rtc.h:18,
                 from drivers/rtc/rtc-proc.c:15:
include/linux/nvmem-provider.h:29:27: warning: ‘nvmem_type_str’ defined but not used [-Wunused-const-variable=]
 static const char * const nvmem_type_str[] = {
                           ^~~~~~~~~~~~~~

Cc: Srinivas Kandagatla <redacted>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/nvmem-provider.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 00ff92571683..e33919ddb026 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h

@@ -26,7 +26,7 @@ enum nvmem_type {
 	NVMEM_TYPE_BATTERY_BACKED,
 };
 
-static const char * const nvmem_type_str[] = {
+static const __maybe_unused char * const nvmem_type_str[] = {