net: wan: framer: Add missing static inline qualifiers

Compilation with CONFIG_GENERIC_FRAMER disabled lead to the following
warnings:
  framer.h:184:16: warning: no previous prototype for function 'framer_get' [-Wmissing-prototypes]
  184 | struct framer *framer_get(struct device *dev, const char *con_id)
  framer.h:184:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
  184 | struct framer *framer_get(struct device *dev, const char *con_id)
  framer.h:189:6: warning: no previous prototype for function 'framer_put' [-Wmissing-prototypes]
  189 | void framer_put(struct device *dev, struct framer *framer)
  framer.h:189:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
  189 | void framer_put(struct device *dev, struct framer *framer)

Add missing 'static inline' qualifiers for these functions.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202403241110.hfJqeJRu-lkp@intel.com/
Fixes: 82c944d0 ("net: wan: Add framer framework support")
Cc: stable@vger.kernel.org
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/framer/framer.h

@@ -181,12 +181,12 @@ static inline int framer_notifier_unregister(struct framer *framer,
 	return -ENOSYS;
 }
 
-struct framer *framer_get(struct device *dev, const char *con_id)
+static inline struct framer *framer_get(struct device *dev, const char *con_id)
 {
 	return ERR_PTR(-ENOSYS);
 }
 
-void framer_put(struct device *dev, struct framer *framer)
+static inline void framer_put(struct device *dev, struct framer *framer)
 {
 }