(variable_output): Fix typo in comment s/is/if/.

diff --git a/automake.in b/automake.in
index 511c11af7210ff96acf62ac5afaace53212d9ff1..38e185579173f6e8fbf2e85a325aeea2a02b3149 100755 (executable)
--- a/automake.in
+++ b/automake.in
@@ -6899,7 +6899,7 @@ sub variable_loc_and_value_as_list_recursive ($$)
 
 # &variable_output ($VAR, [@CONDS])
 # ---------------------------------
-# Output all the values of $VAR is @COND is not specified, else only
+# Output all the values of $VAR if @COND is not specified, else only
 # that corresponding to @COND.
 sub variable_output ($@)
 {