gst-raiplay-download.sh: fix some shellcheck warnings

diff --git a/shell/gst-raiplay-download.sh b/shell/gst-raiplay-download.sh
index 4fc86d8..088f1ba 100755 (executable)
--- a/shell/gst-raiplay-download.sh
+++ b/shell/gst-raiplay-download.sh
@@ -4,7 +4,7 @@
 
 set -e
 
-[ "x$1" = "x" -o "x$2" = x ] && { echo "usage: $(basename $0) <source_m3u8_url> <output_file>" 1>&2; exit 1; }
+{ [ "x$1" = "x" ] || [ "x$2" = x ]; } && { echo "usage: $(basename "$0") <source_m3u8_url> <output_file>" 1>&2; exit 1; }
 
 SOURCE_URL="$1"
 OUTPUT_FILE="$2"