sparc64: Delete __ret_efault.

It is completely unused.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/include/asm/uaccess_64.h

@@ -82,7 +82,6 @@ static inline int access_ok(int type, const void __user * addr, unsigned long si
 	return 1;
 }
 
-void __ret_efault(void);
 void __retl_efault(void);
 
 /* Uh, these should become the main single-value transfer routines..