Fix BLI_str_rstrip skipping the first character

source/blender/blenlib/intern/string.c

@@ -818,7 +818,7 @@ void BLI_str_toupper_ascii(char *str, const size_t len)
  */
 void BLI_str_rstrip(char *str)
 {
-  for (int i = (int)strlen(str) - 1; i > 0; i--) {
+  for (int i = (int)strlen(str) - 1; i >= 0; i--) {
     if (isspace(str[i])) {
       str[i] = '\0';
     }