Fixed spelling errors found by fossies.org with codespell

xorriso/misc_funct.h

@@ -42,7 +42,7 @@ int System_uname(char **sysname, char **release, char **version,
     [kmgtpe] (2^10 to 2^60) or [s] (2048). (Also accepts capital letters.)
     @param text Input like "42", "2k", "3.14m" or "-1g"
     @param flag Bitfield for control purposes:
-                bit0= return -1 rathern than 0 on failure
+                bit0= return -1 rather than 0 on failure
     @return The derived double value
 */
 double Scanf_io_size(char *text, int flag);