* unif.c (scm_i_read_array): Declare rank as ssize_t, to guarantee

* unif.c (scm_i_read_array): Declare rank as ssize_t, to guarantee
that it is signed.

* strports.c (st_resize_port): Add unsigned char cast.
(scm_mkstrport): Make read/write_buf cast unsigned.

* srfi-13.c (string_titlecase_x): Add unsigned char cast.

* rdelim.c (scm_read_line): Initialize slen.

* load.c (scm_search_path): Remove weird >=1, and add
parentheses to clarify conditions.

* hash.c (scm_hasher): Add const unsigned char cast.

* gh_data.c (gh_chars2byvect): Add scm_t_int8 cast.