selftests: hsr: Use `let' properly.

The timeout in the while loop is never subtracted due wrong usage of
`let' leading to an endless loop if the former condition never gets
true.

Put the statement for let in quotes so it is parsed as a single
statement.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/tools/testing/selftests/net/hsr/hsr_ping.sh b/tools/testing/selftests/net/hsr/hsr_ping.sh
index df914353870862c89acbf18ed77737901e3cf20c..183f4a0f19dd9cf99c10f06a3eed20594a962602 100755 (executable)
--- a/tools/testing/selftests/net/hsr/hsr_ping.sh
+++ b/tools/testing/selftests/net/hsr/hsr_ping.sh
@@ -197,7 +197,7 @@ do
                break
        fi
        sleep 1
-       let WAIT = WAIT - 1
+       let "WAIT = WAIT - 1"
 done
 
 # Just a safety delay in case the above check didn't handle it.