selftests: net: fix rps_default_mask with >32 CPUs

If there is more than 32 cpus the bitmask will start to contain commas, leading to:

./rps_default_mask.sh: line 36: [: 00000000,00000000: integer expression expected

Remove the commas, bash doesn't interpret leading zeroes as oct so that should be good enough. Switch to bash, Simon reports that not all shells support this type of substitution.

---
v3:
- switch to bash
v2: https://lore.kernel.org/all/[email protected]/
- remove all commas
v1: https://lore.kernel.org/all/[email protected]/

---
 tools/testing/selftests/net/rps_default_mask.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

index a26c5624429f..4287a8529890 100755
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 
 readonly ksft_skip=4

@@ -33,6 +33,10 @@ chk_rps() {
 
 	rps_mask=$($cmd /sys/class/net/$dev_name/queues/rx-0/rps_cpus)
 	printf "%-60s" "$msg"
+
+	# In case there is more than 32 CPUs we need to remove commas from masks
+	rps_mask=${rps_mask//,}
+	expected_rps_mask=${expected_rps_mask//,}
 	if [ $rps_mask -eq $expected_rps_mask ]; then
 		echo "[ ok ]"
 	else

2.43.0