mandoc: Initialize the local variable "lastln" in mparse_buf_r().

mandoc: Initialize the local variable "lastln" in mparse_buf_r().

[schwarze]

Log Message:
-----------
Initialize the local variable "lastln" in mparse_buf_r().
While there is no bug, it logically makes sense given the meaning
of the variable that lastln is NULL as long as firstln is NULL.

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:
        read.c

Revision Data
-------------
Index: read.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/read.c,v
retrieving revision 1.212
retrieving revision 1.213
diff -Lread.c -Lread.c -u -p -r1.212 -r1.213
--- read.c
+++ read.c
@@ -157,7 +157,7 @@ mparse_buf_r(struct mparse *curp, struct
 	ln.sz = 256;
 	ln.buf = mandoc_malloc(ln.sz);
 	ln.next = NULL;
-	firstln = loop = NULL;
+	firstln = lastln = loop = NULL;
 	lnn = curp->line;
 	pos = 0;
 	inloop = 0;
--
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