patch 8.1.1312: Coverity warning for using uninitialized variable

Problem:    Coverity warning for using uninitialized variable.
Solution:   Clear exarg_T.

src/channel.c

@@ -2308,6 +2308,7 @@ channel_exe_cmd(channel_T *channel, ch_part_T part, typval_T *argv)
 	exarg_T ea;
 
 	ch_log(channel, "Executing normal command '%s'", (char *)arg);
+	vim_memset(&ea, 0, sizeof(ea));
 	ea.arg = arg;
 	ea.addr_count = 0;
 	ea.forceit = TRUE; /* no mapping */
@@ -2318,6 +2319,7 @@ channel_exe_cmd(channel_T *channel, ch_part_T part, typval_T *argv)
 	exarg_T ea;
 
 	ch_log(channel, "redraw");
+	vim_memset(&ea, 0, sizeof(ea));
 	ea.forceit = *arg != NUL;
 	ex_redraw(&ea);
 	showruler(FALSE);

src/ex_cmds2.c

@@ -1190,9 +1190,9 @@ dialog_changed(
     else
 	ret = vim_dialog_yesnocancel(VIM_QUESTION, NULL, buff, 1);
 
-    /* Init ea pseudo-structure, this is needed for the check_overwrite()
-     * function. */
-    ea.append = ea.forceit = FALSE;
+    // Init ea pseudo-structure, this is needed for the check_overwrite()
+    // function.
+    vim_memset(&ea, 0, sizeof(ea));
 
     if (ret == VIM_YES)
     {

src/quickfix.c

@@ -5809,6 +5809,7 @@ vgr_jump_to_match(
     {
 	exarg_T ea;
 
+	vim_memset(&ea, 0, sizeof(ea));
 	ea.arg = target_dir;
 	ea.cmdidx = CMD_lcd;
 	ex_cd(&ea);
@@ -6109,6 +6110,7 @@ restore_start_dir(char_u *dirname_start)
 	    // appropriate ex command and executing it.
 	    exarg_T ea;
 
+	    vim_memset(&ea, 0, sizeof(ea));
 	    ea.arg = dirname_start;
 	    ea.cmdidx = (curwin->w_localdir == NULL) ? CMD_cd : CMD_lcd;
 	    ex_cd(&ea);

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1312,
 /**/
     1311,
 /**/