staging: rtl8192e: Remove useless equation in debug output

staging: rtl8192e: Remove useless equation in debug output

When "switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)))" results
in "case RTLLIB_STYPE_BEACON:" there is no need to calculate this again
inside "case" and when a frame is a beacon there is no need to print the
frame identifier again as it is explicit.
Same for PROBE RESPONSE and PROBE REQUEST. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/f3c8deddac66d11c41ba720e4048aba37e41e885.1694546300.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>