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66f92cf9d4
Impact: minor new API ksplice added a "starts_with" function, which seems like a common need. When people open-code it they seem to use fixed numbers rather than strlen, so it's quite a readability win (also, strncmp() almost always wants != 0 on it). So here's strstarts(). Cc: Anders Kaseorg <andersk@mit.edu> Cc: Jeff Arnold <jbarnold@mit.edu> Cc: Tim Abbott <tabbott@mit.edu> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>