Minor changes to address lint in geodesic.c

[cffk]

This addresses some compiler warning reported to me by Marc Emery memery@myotest.com. The changes are super-innocuous. For the record, the compiler flags were:

-Wall -Wextra -Wpointer-arith -Wcast-align -Wwrite-strings -Wswitch-default
-Wunreachable-code -Winit-self -Wmissing-field-initializers
-Wno-unknown-pragmas -Wstrict-prototypes -Wundef -Wold-style-definition -std=c99

And to show what a novice I am at C programming, I didn't konw the exact meaning of the C declaration

static void Init();

i.e., that it's not the same as

static void Init(void);

[cffk]

I'll wait until tomorrow and then merge...