net: pktgen: fix code style (ERROR: else should follow close brace '}')

Fix checkpatch code style errors:

  ERROR: else should follow close brace '}'
  #1317: FILE: net/core/pktgen.c:1317:
  +               }
  +               else

And checkpatch follow up code style check:

  CHECK: Unbalanced braces around else statement
  #1316: FILE: net/core/pktgen.c:1316:
  +               } else

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250415112916.113455-2-ps.report@gmx.net


Signed-off-by: Paolo Abeni <pabeni@redhat.com>