Chomp file ends

Removed empty lines from end of src/*.[ch] files.
If the new last line became '#endif'
was the condition of the '#if' added.

src/ip6addr.h

@@ -31,4 +31,3 @@
          && ((__const uint32_t *) (a))[1] == 0                                \
          && ((__const uint32_t *) (a))[2] == 0                                \
          && ((__const uint32_t *) (a))[3] == 0)
-