Fix warnings generated by clang 3.4 on x86_64.

This commit fixes the following warnings:
{{{
csctapi/ifd_mp35.c:27:28: warning: unused variable 'power_always_on' [-Wunused-const-variable]
csctapi/ifd_mp35.c:28:28: warning: unused variable 'set_vpp' [-Wunused-const-variable]
csctapi/ifd_mp35.c:29:28: warning: unused variable 'set_data' [-Wunused-const-variable]
csctapi/ifd_mp35.c:30:28: warning: unused variable 'set_oscillator' [-Wunused-const-variable]
csctapi/ifd_mp35.c:31:28: warning: unused variable 'terminate_com' [-Wunused-const-variable]
csctapi/ifd_mp35.c:32:28: warning: unused variable 'transthrough_mode' [-Wunused-const-variable]
csctapi/ifd_mp35.c:34:28: warning: unused variable 'smartmouse_mode' [-Wunused-const-variable]
csctapi/ifd_mp35.c:36:28: warning: unused variable 'smartmouse_6mhz_mode' [-Wunused-const-variable]
module-webif-lib.c:118:65: warning: expression which evaluates to zero treated as a null pointer constant of type 'time_t *' (aka 'long *')
module-webif-lib.c:137:20: warning: expression which evaluates to zero treated as a null pointer constant of type 'time_t *' (aka 'long *')
reader-dgcrypt.c:12:22: warning: unused variable 'cmd_SUBSYS' [-Wunused-const-variable]
oscam-config-global.c:846:37: warning: expression which evaluates to zero treated as a null pointer constant of type 'char **' [-Wnon-literal-null-conversion]
oscam-garbage.c:100:26: warning: expression which evaluates to zero treated as a null pointer constant of type 'time_t *' (aka 'long *')
}}}

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9425 4b0bc96b-bc66-0410-9d44-ebda105a78c1