Blackfin arch: cplb mananger: use a do...while loop rather than a for loop

use a do...while loop rather than a for loop to get slightly better
optimization and to avoid gcc "may be used uninitialized" warnings ...
we know that the [id]cplb_nr_bounds variables will never be 0, so this
is OK
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/cplb-nompu/cplbmgr.c

@@ -163,12 +163,14 @@ MGR_ATTR static int icplb_miss(int cpu)
 		nr_icplb_supv_miss[cpu]++;
 
 	base = 0;
-	for (idx = 0; idx < icplb_nr_bounds; idx++) {
+	idx = 0;
+	do {
 		eaddr = icplb_bounds[idx].eaddr;
 		if (addr < eaddr)
 			break;
 		base = eaddr;
-	}
+	} while (++idx < icplb_nr_bounds);
+
 	if (unlikely(idx == icplb_nr_bounds))
 		return CPLB_NO_ADDR_MATCH;
 
@@ -208,12 +210,14 @@ MGR_ATTR static int dcplb_miss(int cpu)
 		nr_dcplb_supv_miss[cpu]++;
 
 	base = 0;
-	for (idx = 0; idx < dcplb_nr_bounds; idx++) {
+	idx = 0;
+	do {
 		eaddr = dcplb_bounds[idx].eaddr;
 		if (addr < eaddr)
 			break;
 		base = eaddr;
-	}
+	} while (++idx < dcplb_nr_bounds);
+
 	if (unlikely(idx == dcplb_nr_bounds))
 		return CPLB_NO_ADDR_MATCH;