gtp: fix several compilation warnings

  CC       gtpie.lo
gtpie.c: In function 'gtpie_encaps':
gtpie.c:437:22: warning: variable 'm' set but not used [-Wunused-but-set-variable]
  union gtpie_member *m;
                      ^
gtpie.c: In function 'gtpie_encaps2':
gtpie.c:537:22: warning: variable 'm' set but not used [-Wunused-but-set-variable]
  union gtpie_member *m;
                      ^

lookup.c: In function ‘lookup’:
lookup.c:40:24: warning: typedef ‘ub1’ locally defined but not used [-Wunused-local-typedefs]
  typedef unsigned char ub1; /* unsigned 1-byte quantities */
                        ^

Still one compilation warning left in cmdline.c, but that code
is autogenerated.
2 files changed