ITS#8878 Include the first character in the transformation

contrib/slapd-modules/passwd/pbkdf2/pw-pbkdf2.c

@@ -59,15 +59,14 @@ const struct berval pbkdf2_sha512_scheme = BER_BVC("{PBKDF2-SHA512}");
 static int b64_to_ab64(char *str)
 {
 	char *p = str;
-	while(*p++){
+	do {
 		if(*p == '+'){
 			*p = '.';
 		}
 		if(*p == '='){
 			*p = '\0';
-			break;
 		}
-	}
+	} while(*p++);
 	return 0;
 }