Fix running the tests with -fsanitize=address.

src/case.c

 /* Unicode Case Conversion
  *
- * Copyright (C) 2012-2018 Reece H. Dunn
+ * Copyright (C) 2012-2018, 2021 Reece H. Dunn
  *
  * This file is part of ucd-tools.
  *
 codepoint_t ucd_toupper(codepoint_t c)
 {
 	int begin = 0;
-	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]);
+	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]) - 1;
 	while (begin <= end)
 	{
 		int pos = (begin + end) / 2;
 codepoint_t ucd_tolower(codepoint_t c)
 {
 	int begin = 0;
-	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]);
+	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]) - 1;
 	while (begin <= end)
 	{
 		int pos = (begin + end) / 2;
 codepoint_t ucd_totitle(codepoint_t c)
 {
 	int begin = 0;
-	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]);
+	int end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]) - 1;
 	while (begin <= end)
 	{
 		int pos = (begin + end) / 2;

tools/case.py

 #!/usr/bin/python
 
-# Copyright (C) 2012-2018 Reece H. Dunn
+# Copyright (C) 2012-2018, 2021 Reece H. Dunn
 #
 # This file is part of ucd-tools.
 #
 if __name__ == '__main__':
 	sys.stdout.write("""/* Unicode Case Conversion
  *
- * Copyright (C) 2012-2018 Reece H. Dunn
+ * Copyright (C) 2012-2018, 2021 Reece H. Dunn
  *
  * This file is part of ucd-tools.
  *
 		sys.stdout.write('codepoint_t ucd_to%s(codepoint_t c)\n' % case)
 		sys.stdout.write('{\n')
 		sys.stdout.write('\tint begin = 0;\n')
-		sys.stdout.write('\tint end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]);\n')
+		sys.stdout.write('\tint end   = sizeof(case_conversion_data)/sizeof(case_conversion_data[0]) - 1;\n')
 		sys.stdout.write('\twhile (begin <= end)\n')
 		sys.stdout.write('\t{\n')
 		sys.stdout.write('\t\tint pos = (begin + end) / 2;\n')