.cirrus.yml: `$` is redundant for variable names within `$((...))`

... as shellcheck likes to often remind me.

diff --git a/.cirrus.yml b/.cirrus.yml
index c52a496d8784ec2875e569c0678af0954f047a41..1fe4ec03becb87c7efa9caf3103b32193dffc307 100644 (file)
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -153,7 +153,7 @@ non_standard_toolchains_task:
             if ! $(ldd ".libs/${plugin}.so" 2>/dev/null | grep -q 'libstatgrab.so'); then
               echo "plugin ${plugin} is NOT linked against libstatgrab:"
               ldd ".libs/${plugin}.so" | sed -e 's/^/    /'
-              err=$(($err + 1))
+              err=$((err + 1))
             fi
           done
           exit $err