staging: fix all sparse warnings in silicom/bypasslib/

Fix all sparse warning in drivers/staging/silicom/bypasslib/,
e.g.:

drivers/staging/silicom/bypasslib/bypass.c:471:21: warning: non-ANSI function declaration of function 'init_lib_module'
drivers/staging/silicom/bypasslib/bypass.c:478:25: warning: non-ANSI function declaration of function 'cleanup_lib_module'
drivers/staging/silicom/bypasslib/bypass.c:137:5: warning: symbol 'is_bypass_dev' was not declared. Should it be static?
drivers/staging/silicom/bypasslib/bypass.c:182:5: warning: symbol 'is_bypass' was not declared. Should it be static?
drivers/staging/silicom/bypasslib/bypass.c:192:5: warning: symbol 'get_bypass_slave' was not declared. Should it be static?
drivers/staging/silicom/bypasslib/bypass.c:197:5: warning: symbol 'get_bypass_caps' was not declared. Should it be static?
drivers/staging/silicom/bypasslib/bypass.c:202:5: warning: symbol 'get_wd_set_caps' was not declared. Should it be static?
etc.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>