alpha: fix macros

When this macros isn't called with 'fixup', e.g.  with foo this will
incorectly expand to foo->foo.bits.errreg
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/include/asm/uaccess.h

@@ -498,13 +498,13 @@ struct exception_table_entry
 };
 
 /* Returns the new pc */
-#define fixup_exception(map_reg, fixup, pc)			\
+#define fixup_exception(map_reg, _fixup, pc)			\
 ({								\
-	if ((fixup)->fixup.bits.valreg != 31)			\
-		map_reg((fixup)->fixup.bits.valreg) = 0;	\
-	if ((fixup)->fixup.bits.errreg != 31)			\
-		map_reg((fixup)->fixup.bits.errreg) = -EFAULT;	\
-	(pc) + (fixup)->fixup.bits.nextinsn;			\
+	if ((_fixup)->fixup.bits.valreg != 31)			\
+		map_reg((_fixup)->fixup.bits.valreg) = 0;	\
+	if ((_fixup)->fixup.bits.errreg != 31)			\
+		map_reg((_fixup)->fixup.bits.errreg) = -EFAULT;	\
+	(pc) + (_fixup)->fixup.bits.nextinsn;			\
 })