patch 8.1.0886: compiler warning for NULL pointer and condition always true

Problem:    Compiler warning for adding to NULL pointer and a condition that
            is always true.
Solution:   Check for NULL pointer before adding. Remove useless "if".
            (Friedirch, closes #3913)

src/dosinst.c

@@ -291,16 +291,17 @@ findoldfile(char **destination)
 {
     char	*bp = *destination;
     size_t	indir_l = strlen(installdir);
-    char	*cp = bp + indir_l;
+    char	*cp;
     char	*tmpname;
     char	*farname;
 
     /*
      * No action needed if exe not found or not in this directory.
      */
-    if (bp == NULL
+    if (bp == NULL || strnicmp(bp, installdir, indir_l) != 0)
-	    || strnicmp(bp, installdir, indir_l) != 0
+	return;
-	    || strchr("/\\", *cp++) == NULL
+    cp = bp + indir_l;
+    if (strchr("/\\", *cp++) == NULL
 	    || strchr(cp, '\\') != NULL
 	    || strchr(cp, '/') != NULL)
 	return;

src/search.c

@@ -4732,8 +4732,6 @@ current_search(
     VIsual_active = TRUE;
     VIsual_mode = 'v';
 
-    if (VIsual_active)
-    {
     redraw_curbuf_later(INVERTED);	/* update the inversion */
     if (*p_sel == 'e')
     {
@@ -4744,8 +4742,6 @@ current_search(
 	    inc(&VIsual);
     }
 
-    }
-
 #ifdef FEAT_FOLDING
     if (fdo_flags & FDO_SEARCH && KeyTyped)
 	foldOpenCursor();

src/version.c

@@ -783,6 +783,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    886,
 /**/
     885,
 /**/