staging: rtl8723bs: fix firmware memory leak on error

staging: rtl8723bs: fix firmware memory leak on error

After successfully calling request_firmware(), if the firmware size
check fails or if kmemdup() fails, the code jumps to the exit label
without calling release_firmware(), causing a memory leak. Call
release_firmware() directly in each error path before jumping to cleanup
label.

Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@oracle.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/20260130001641.17941-2-samasth.norway.ananda@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>