patch 8.2.3527: gcc complains about uninitialized variable

Problem:    Gcc complains about uninitialized variable. (Tony Mechelynck)
Solution:   Initialize it.
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index c55d979..e107c5e 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -5605,7 +5605,7 @@
     int		byte_sum;	// byte position in string
     char_u	*cs;		// current *s pointer
     int		needs_pango;	// look ahead, 0=ascii 1=unicode/ligatures
-    int		should_need_pango;
+    int		should_need_pango = FALSE;
     int		slen;
     int		is_ligature;
     int		next_is_ligature;
@@ -5743,6 +5743,7 @@
 		slen++; // ascii
 	    }
 	}
+
 	// temporarily zero terminate substring, print, restore char, wrap
 	backup_ch = *(cs + slen);
 	*(cs + slen) = 0;