scripts: qemu-check.sh: Use getopts

Use getopts to parse the arguments instead of manual parsing to leave no
room for errors, bugs, and inconsistent conventions introduced by custom
implementation.

The script uses no options as of now, so current implementation just
exits if any option is provided.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>

scripts/qemu-check.sh

@@ -7,18 +7,33 @@ READY_MSG="6c 00 00 00 00 00 00 70"
 
 rm -f dump-*.txt
 
+print_usage()
+{
+	cat <<EOF
+usage: qemu-check.sh platform(s)
+	Supported platforms are ${SUPPORTED_PLATFORMS[*]}
+EOF
+}
+
+while getopts "" OPTION; do
+	case "$OPTION" in
+		*) print_usage; exit 1 ;;
+	esac
+done
+shift $((OPTIND-1))
+
 PLATFORMS=()
-if [ "$#" -eq 0 ]
-then
+if [ "$#" -eq 0 ]; then
 	PLATFORMS=("${SUPPORTED_PLATFORMS[@]}")
 else
-	for args in $@
-	do
-		for i in ${SUPPORTED_PLATFORMS[@]}
-		do
-			if [ $i == $args ]
-			then
-				PLATFORMS=("${PLATFORMS[@]}" "$i")
+	for arg in "$@"; do
+		platform=unknown
+		for sp in "${SUPPORTED_PLATFORMS[@]}"; do
+			if [ x"$sp" = x"$arg" ]; then
+				PLATFORMS=("${PLATFORMS[@]}" "$sp")
+				platform=$sp
+				shift
+				break
 			fi
 		done
 	done