patch 8.0.0236: gcc complains about uninitialized variable

Problem:    Gcc complains that a variable may be used uninitialized. Confusion
            between variable and label name. (John Marriott)
Solution:   Initialize it.  Rename end to end_lnum.
diff --git a/src/ops.c b/src/ops.c
index 2aee03d..7d656a6 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -3774,13 +3774,13 @@
 	 */
 	if (y_type == MCHAR && y_size == 1)
 	{
-	    linenr_T end;
+	    linenr_T end_lnum = 0; /* init for gcc */
 
 	    if (VIsual_active)
 	    {
-		end = curbuf->b_visual.vi_end.lnum;
-		if (end < curbuf->b_visual.vi_start.lnum)
-		    end = curbuf->b_visual.vi_start.lnum;
+		end_lnum = curbuf->b_visual.vi_end.lnum;
+		if (end_lnum < curbuf->b_visual.vi_start.lnum)
+		    end_lnum = curbuf->b_visual.vi_start.lnum;
 	    }
 
 	    do {
@@ -3815,7 +3815,7 @@
 		}
 		if (VIsual_active)
 		    lnum++;
-	    } while (VIsual_active && lnum <= end);
+	    } while (VIsual_active && lnum <= end_lnum);
 
 	    if (VIsual_active) /* reset lnum to the last visual line */
 		lnum--;
diff --git a/src/version.c b/src/version.c
index 65208d0..684a244 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    236,
+/**/
     235,
 /**/
     234,