alpha: fix marvel_ioread8 build regression

The previous build fix contained a small typo that led to
another regression:

arch/alpha/kernel/core_marvel.c:807:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'marvel_ioread8'

Reported-by: kernel test robot <lkp@intel.com>
Fixes: e19d4ebc53 ("alpha: add full ioread64/iowrite64 implementation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/alpha/kernel/core_marvel.c

@@ -803,7 +803,7 @@ void __iomem *marvel_ioportmap (unsigned long addr)
 	return (void __iomem *)addr;
 }
 
-unsigned u8
+u8
 marvel_ioread8(const void __iomem *xaddr)
 {
 	unsigned long addr = (unsigned long) xaddr;