Fix compiler warnings

- implicit declaration of built-in function 'strncpy'
- control reaches end of non-void function
- assignment to 'void (*)(int,  siginfo_t *, void *)' from incompatible pointer type 'void (*)(int)'

impl/src/jsonlogger.c

@@ -6,6 +6,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "jsonlogger.h"
 
@@ -81,6 +82,8 @@ static bool dump_var_array_cf(const var_array_cf_t *varray)
 	}
 
 	LOG_OR_RETURN("]");
+
+	return true;
 }
 
 

impl/test/test_jsonlogger.c

@@ -45,9 +45,10 @@ int main()
 	}
 
 	// ignore SIGPIPE
-	term_action.sa_sigaction = SIG_IGN;
-
-	if(sigaction(SIGPIPE, &term_action, NULL) < 0) {
+	struct sigaction term_action_ign = {
+		.sa_handler = SIG_IGN,
+	};
+	if(sigaction(SIGPIPE, &term_action_ign, NULL) < 0) {
 		perror("sigaction");
 		exit(EXIT_FAILURE);
 	}