Use clang-tidy to add curly braces around one-line statements

The command used to reformat the files in this commit was:

./util/run-clang-tidy \
	-clang-tidy-binary clang-tidy-11
	-clang-apply-replacements-binary clang-apply-replacements-11 \
	-checks=-*,readability-braces-around-statements \
	-j 9 \
	-fix \
	-format \
	-style=file \
	-quiet
clang-format -i --style=format $(git ls-files '*.c' '*.h')
uncrustify -c .uncrustify.cfg --replace --no-backup $(git ls-files '*.c' '*.h')
clang-format -i --style=format $(git ls-files '*.c' '*.h')

lib/isc/tests/regex_test.c

@@ -21,7 +21,7 @@
 
 #ifdef HAVE_REGEX_H
 #include <regex.h>
-#endif
+#endif /* ifdef HAVE_REGEX_H */
 
 #define UNIT_TESTING
 #include <cmocka.h>
@@ -45,7 +45,8 @@ regex_validate(void **state)
 	struct {
 		const char *expression;
 		int	    expect;
-		int	    exception; /* regcomp accepts but is disallowed. */
+		int	    exception; /* regcomp accepts but is
+					* disallowed. */
 	} tests[] = {
 		{ "", -1, 0 },
 		{ "*", -1, 0 },
@@ -2322,7 +2323,7 @@ regex_validate(void **state)
 			regfree(&preg);
 		}
 	}
-#endif
+#endif /* ifdef HAVE_REGEX_H */
 
 	/*
 	 * Check if we get the expected response.
@@ -2369,4 +2370,4 @@ main(void)
 	return (0);
 }
 
-#endif
+#endif /* if HAVE_CMOCKA */