patch 8.2.4470: Coverity warns for uninitialized variable

Problem:    Coverity warns for uninitialized variable.
Solution:   Set can_spell to zero.

src/drawline.c

@@ -330,7 +330,7 @@ win_line(
 #endif
 #ifdef FEAT_SPELL
     int		has_spell = FALSE;	// this buffer has spell checking
-    int		can_spell;
+    int		can_spell = FALSE;
 # define SPWORDLEN 150
     char_u	nextline[SPWORDLEN * 2];// text with start of the next line
     int		nextlinecol = 0;	// column where nextline[] starts

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4470,
 /**/
     4469,
 /**/