Fix typo

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Jesper Nilsson <jespern@axis.com>

arch/cris/include/uapi/arch-v10/arch/sv_addr_ag.h

@@ -61,7 +61,7 @@
 #define IO_WIDTH(reg, field) IO_WIDTH_ (reg##_, field##_)
 #define IO_WIDTH_(reg_, field_) (reg_##_##field_##_WIDTH)
 
-/*--- Obsolete. Kept for backw compatibility. ---*/
+/*--- Obsolete. Kept for backward compatibility. ---*/
 /* Reads (or writes) a byte/uword/udword from the specified mode
    register. */
 #define IO_RD(reg) (*(volatile u32*)(reg))