microblaze: Remove compilation warnings in cache macro

CC      arch/microblaze/kernel/cpu/cache.o
arch/microblaze/kernel/cpu/cache.c: In function '__invalidate_dcache_range_wb':
arch/microblaze/kernel/cpu/cache.c:398: warning: ISO C90 forbids mixed declarations and code
arch/microblaze/kernel/cpu/cache.c: In function '__flush_dcache_range_wb':
arch/microblaze/kernel/cpu/cache.c:509: warning: ISO C90 forbids mixed declara

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/cpu/cache.c

@@ -137,8 +137,9 @@ do {									\
 do {									\
 	int step = -line_length;					\
 	int align = ~(line_length - 1);					\
+	int count;							\
 	end = ((end & align) == end) ? end - line_length : end & align;	\
-	int count = end - start;					\
+	count = end - start;						\
 	WARN_ON(count < 0);						\
 									\
 	__asm__ __volatile__ (" 1:	" #op "	%0, %1;			\