scripts/winefps: Refactor

.scripts/winefps

@@ -9,16 +9,16 @@ EOF
 	exit
 fi
 
-if ! command -v osd_cat >/dev/null; then
-	echo >&2 "You need osd_cat."
+if ! command -v osd_cat >/dev/null 2>&1; then
+	echo >&2 "osd_cat not found in path."
 	exit 1
 fi
 
 ## The unbuffered option is -u on GNU and OpenBSD, -l on others.
 OPT_UNBUF=-l
-if [ "$(uname)" = "Linux" ] || [ "$(uname)" = "OpenBSD" ]; then
-	OPT_UNBUF=-u
-fi
+case "$(uname)" in
+Linux|OpenBSD) OPT_UNBUF=-u ;;
+esac
 
 WINEDEBUG=fps wine "$@" 2>&1 | tee /dev/stderr | \
 	sed $OPT_UNBUF -n '/^trace:fps:/{s/.* \([^ ]*\)fps/\1/;p}' | \