target-microblaze: dec_barrel: Use bool instead of unsigned int

Use bool instead of unsigned int to represent flags.
No functional change.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>

target/microblaze/translate.c

@@ -660,7 +660,7 @@ static void dec_div(DisasContext *dc)
 static void dec_barrel(DisasContext *dc)
 {
     TCGv t0;
-    unsigned int s, t;
+    bool s, t;
 
     if ((dc->tb_flags & MSR_EE_FLAG)
           && (dc->cpu->env.pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)