xzless: Rename unused variables to silence static analysers.

In this particular case I don't see this affecting readability
of the code.

Thanks to Pavel Raiskup.

src/liblzma/api/lzma/filter.h

@@ -341,9 +341,10 @@ extern LZMA_API(lzma_ret) lzma_properties_encode(
  * \param       filter      filter->id must have been set to the correct
  *                          Filter ID. filter->options doesn't need to be
  *                          initialized (it's not freed by this function). The
- *                          decoded options will be stored to filter->options.
- *                          filter->options is set to NULL if there are no
- *                          properties or if an error occurs.
+ *                          decoded options will be stored in filter->options;
+ *                          it's application's responsibility to free it when
+ *                          appropriate. filter->options is set to NULL if
+ *                          there are no properties or if an error occurs.
  * \param       allocator   Custom memory allocator used to allocate the
  *                          options. Set to NULL to use the default malloc(),
  *                          and in case of an error, also free().

src/liblzma/common/index.c

@@ -825,8 +825,8 @@ lzma_index_cat(lzma_index *restrict dest, lzma_index *restrict src,
 				s->groups.root = &newg->node;
 			}
 
-			if (s->groups.rightmost == &g->node)
-				s->groups.rightmost = &newg->node;
+			assert(s->groups.rightmost == &g->node);
+			s->groups.rightmost = &newg->node;
 
 			lzma_free(g, allocator);
 

src/scripts/xzless.in

@@ -46,7 +46,7 @@ if test "${LESSMETACHARS+set}" != set; then
 	LESSMETACHARS="$space$tab$nl'"';*?"()<>[|&^`#\$%=~'
 fi
 
-if test "$(less -V | { read less ver re && echo ${ver}; })" -ge 429; then
+if test "$(less -V | { read _ ver _ && echo ${ver}; })" -ge 429; then
 	# less 429 or later: LESSOPEN pipe will be used on
 	# standard input if $LESSOPEN begins with |-.
 	LESSOPEN="|-$xz -cdfq -- %s"