Fix all warnings in the main codebase flagged by -Wsigned-compare

Remember, the code
   int is_less_than(int a, unsigned b) {
      return a < b;
   }
is buggy, since the C integer promotion rules basically turn it into
   int is_less_than(int a, unsigned b) {
      return ((unsigned)a) < b;
   }
and we really want something closer to
   int is_less_than(int a, unsigned b) {
      return a < 0 || ((unsigned)a) < b;
   }
.

Suggested by an example from Ralph Castain

1 files changed, 1 insertions, 1 deletions

diff --git a/log-internal.h b/log-internal.h
index 3545da9d..d150e209 100644
--- a/log-internal.h
+++ b/log-internal.h
@@ -37,7 +37,7 @@
 #define EV_NORETURN
 #endif
 
-#define _EVENT_ERR_ABORT 0xdeaddead
+#define _EVENT_ERR_ABORT ((int)0xdeaddead)
 
 void event_err(int eval, const char *fmt, ...) EV_CHECK_FMT(2,3) EV_NORETURN;
 void event_warn(const char *fmt, ...) EV_CHECK_FMT(1,2);