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0d1a675fff
What changes:
- imsg_init becomes imsgbuf_init but imsgbuf_init can now fail
- Adding imsgbuf functions to hide the msgbuf functions:
msgbuf_clear -> imsgbuf_clear
msgbuf_write -> imsgbuf_write
- Also rename imsg_read to imsgbuf_read.
- Both imsgbuf_read and imsgbuf_write have simplified error handling.
imsgbuf_write now returns 0 on success so that old wrong connection
closed check must be removed
- Remove now official ibuf_get_string()
OK tb@ matthieu@