RX: Fix 168 warnings as "declaration of 'x' shadows a previous local"

RX: Fix 168 warnings as "declaration of 'x' shadows a previous local"

An example of these warnings is:
./print-rx.c: In function 'fs_print':
./print-rx.c:774:35: warning: declaration of 'i' shadows a previous local [-Wshadow]
 #define UINTOUT() { unsigned long i; \
                                   ^
./print-rx.c:916:4: note: in expansion of macro 'UINTOUT'
    UINTOUT();
    ^
./print-rx.c:883:16: warning: shadowed declaration is here [-Wshadow]
  unsigned long i;
                ^