[PATCH] sh: Fix set but not used warnings with !CONFIG_MMU

[Sam Ravnborg <sam@ravnborg.org>]

Building fbdev drivers for sh with W=1 produces the following warning:

    tmiofb.c: In function ‘tmiofb_remove’:
    tmiofb.c:805:21: warning: variable ‘par’ set but not used

This is with allmodconfig and ARCH=sh

This boiled down to iounmap() defined as empty for !CONFIG_MMU.
Fix this by by adding "(void)addr;" to tell the compiler the
argument to iounmap() should be considered used.

v4:
  - Fix build error of ethernet driver (kernel test robot)
    Added missing () around macro parameter

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: kernel test robot <lkp@intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 arch/sh/include/asm/io.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 6d5c6463bc07..45082bcbd9aa 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -271,7 +271,7 @@ static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
 #endif /* CONFIG_HAVE_IOREMAP_PROT */
 
 #else /* CONFIG_MMU */
-#define iounmap(addr)		do { } while (0)
+#define iounmap(addr)		do { (void)(addr); } while (0)
 #define ioremap(offset, size)	((void __iomem *)(unsigned long)(offset))
 #endif /* CONFIG_MMU */
 
-- 
2.27.0