[committed] Fix up run_all.sh

[Jakub Jelinek]

Hi!

I've committed following fix as obvious, to avoid thousands of
mkdir: cannot create directory 
`/usr/src/gcc/obj084/gcc/testsuite/ada/acats-parallel/10': File exists          
                                    
lines in output when checking acats in parallel.

2014-09-17  Jakub Jelinek  <ja...@redhat.com>

        * ada/acats/run_all.sh: Redirect mkdir stderr to /dev/null.

--- gcc/testsuite/ada/acats/run_all.sh.jj       2014-09-15 20:19:15.000000000 
+0200
+++ gcc/testsuite/ada/acats/run_all.sh  2014-09-17 19:46:34.921752227 +0200
@@ -268,7 +268,7 @@ for chapter in $chapters; do
               if [ $par_countm -eq 1 ]; then
                  as_fn_arith $par_count + 1
                  par_count=$as_val
-                 if mkdir $GCC_RUNTEST_PARALLELIZE_DIR/$par_count; then
+                 if mkdir $GCC_RUNTEST_PARALLELIZE_DIR/$par_count 2>/dev/null; 
then
                     par_last=1
                  else
                     par_last=

        Jakub