mandoc: Initialize the local variable "act" in print_mdoc_node().

mandoc: Initialize the local variable "act" in print_mdoc_node().

[schwarze]

Log Message:
-----------
Initialize the local variable "act" in print_mdoc_node().
While there is no bug, it helps clarity, and it is also safer in this
particular code because in case a bug gets introduced later, accessing
a NULL pointer is less dangerous than accessing an uninitialized pointer.

Michal Nowak <mnowak at startmail dot com> reported that gcc 4.4.4 
and 7.4.0 on illumos throw -Wuninitialized false positives.

Modified Files:
--------------
    mandoc:
        mdoc_term.c

Revision Data
-------------
Index: mdoc_term.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_term.c,v
retrieving revision 1.372
retrieving revision 1.373
diff -Lmdoc_term.c -Lmdoc_term.c -u -p -r1.372 -r1.373
--- mdoc_term.c
+++ mdoc_term.c
@@ -352,6 +352,7 @@ print_mdoc_node(DECL_ARGS)
 	 * produce output.  Note that some pre-handlers do so.
 	 */
 
+	act = NULL;
 	switch (n->type) {
 	case ROFFT_TEXT:
 		if (n->flags & NODE_LINE) {
--
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