[PATCH blktests 4/5] common/rc: _have_iproute2 fix for "ip -V" change

[Yi Zhang]

With bellow commit, the version will be updated base on the tag
fbef6555 replace SNAPSHOT with auto-generated version string

To reproduce it:
$ ./check srp/015
common/rc: line 98: [: ip utility, iproute2-5.9.0: integer expression expected

Signed-off-by: Yi Zhang <yi.zhang at redhat.com>
---
 common/rc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/rc b/common/rc
index 0d7a3cd..37eb873 100644
--- a/common/rc
+++ b/common/rc
@@ -95,7 +95,7 @@ _have_iproute2() {
 		SKIP_REASON="ip utility not found"
 		return 1
 	fi
-	if [ "$snapshot" -lt "$1" ]; then
+	if [[ "$snapshot" =~ ^[0-9]+$ && "$snapshot" -lt "$1" ]]; then
 		SKIP_REASON="ip utility too old"
 		return 1
 	fi
-- 
2.21.0