target-microblaze: dec_barrel: Plug TCG temp leak

Plug TCG temp leak.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>

target/microblaze/translate.c

@@ -690,6 +690,7 @@ static void dec_barrel(DisasContext *dc)
             tcg_gen_shr_tl(cpu_R[dc->rd], cpu_R[dc->ra], t0);
         }
     }
+    tcg_temp_free(t0);
 }
 
 static void dec_bit(DisasContext *dc)