[bug-recutils] [bug #30621] The code is not checking the return values of all system calls

[Markus Elfring]

Follow-up Comment #6, bug #30621 (project recutils):

I suggest to avoid unchecked function calls.
Would you like to add more error handling for return values from "printf" like
in the function "rec_sex_ast_print_node" and from "strdup" in the function
"rec_write_comment"?

http://git.savannah.gnu.org/cgit/recutils.git/tree/src/rec-sex-ast.c?id=e24c2e65200f5f46f1d5b8a7a3b377c6e953204e#n249
http://git.savannah.gnu.org/cgit/recutils.git/tree/src/rec-writer.c?id=32e6feb78680846858fa971e51bb5385d69e3104#n114

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