sh: macro whitespace fixes

While working on arch/sh/include/asm/uaccess.h, I noticed
that one macro within this header is made harder to read because it
violates a coding style rule: space is missing after comma.

Fix it up.

Signed-off-by: Michael S. Tsirkin <[e-mail]>

arch/sh/include/asm/segment.h

···
 #define USER_DS		KERNEL_DS
 #endif
 
-#define segment_eq(a,b)	((a).seg == (b).seg)
+#define segment_eq(a, b) ((a).seg == (b).seg)
 
 #define get_ds()	(KERNEL_DS)