tests: Fix style in ra.py

No functional change intended.

MFC after:	2 weeks

tests/sys/netinet6/ra.py

@@ -1,4 +1,4 @@
-#-
+#
 # SPDX-License-Identifier: BSD-2-Clause
 #
 # Copyright (c) 2024 Klara, Inc.
@@ -8,31 +8,33 @@
 import scapy.all as sp
 import sys
 
+
 #
 # Emit a router advertisement with the specified prefix.
 #
 def main():
     parser = argparse.ArgumentParser("ra.py",
-        description="Emits Router Advertisement packets")
+                                     description="Emits Router Advertisement packets")
     parser.add_argument('--sendif', nargs=1, required=True,
-        help='The interface through which the packet will be sent')
+                        help='The interface through which the packet will be sent')
     parser.add_argument('--src', nargs=1, required=True,
-        help='The source IP address')
+                        help='The source IP address')
     parser.add_argument('--dst', nargs=1, required=True,
-        help='The destination IP address')
+                        help='The destination IP address')
     parser.add_argument('--prefix', nargs=1, required=True,
-        help='The prefix to be advertised')
+                        help='The prefix to be advertised')
     parser.add_argument('--prefixlen', nargs=1, required=True, type=int,
-        help='The prefix length to be advertised')
+                        help='The prefix length to be advertised')
 
     args = parser.parse_args()
     pkt = sp.Ether() / \
-          sp.IPv6(src=args.src, dst=args.dst) / \
-          sp.ICMPv6ND_RA(chlim=64) / \
-          sp.ICMPv6NDOptPrefixInfo(prefix=args.prefix, prefixlen=args.prefixlen)
+        sp.IPv6(src=args.src, dst=args.dst) / \
+        sp.ICMPv6ND_RA(chlim=64) / \
+        sp.ICMPv6NDOptPrefixInfo(prefix=args.prefix, prefixlen=args.prefixlen)
 
     sp.sendp(pkt, iface=args.sendif[0], verbose=False)
     sys.exit(0)
 
+
 if __name__ == '__main__':
     main()