build_matrix.sh: Fix a shellcheck note

The note was:
Double quote to prevent globbing and word splitting. [SC2086]

diff --git a/build_matrix.sh b/build_matrix.sh
index 8ae6a9c736db2d75e8736d37d4f248175aa20e11..0f10015a5adbd21515c230c6abd08d329780cad6 100755 (executable)
--- a/build_matrix.sh
+++ b/build_matrix.sh
@@ -37,7 +37,7 @@ for CC in $MATRIX_CC; do
         continue
     fi
     for BUILD_LIBPCAP in $MATRIX_BUILD_LIBPCAP; do
-        COUNT=`increment $COUNT`
+        COUNT=`increment "$COUNT"`
         echo_magenta "===== SETUP $COUNT: CC=$CC BUILD_LIBPCAP=$BUILD_LIBPCAP ====="  >&2
         if [ "$BUILD_LIBPCAP" = yes ]; then
             echo_magenta "Build libpcap (CMAKE=no)" >&2