patch 8.0.1753: various warnings from a static analyser

Problem:    Various warnings from a static analyser
Solution:   Add type casts, remove unneeded conditions. (Christian Brabandt,
            closes #2770)

src/evalfunc.c

@@ -10194,7 +10194,7 @@ set_buffer_lines(buf_T *buf, linenr_T lnum, typval_T *lines, typval_T *rettv)
 	}
 
 	rettv->vval.v_number = 1;	/* FAIL */
-	if (line == NULL || lnum < 1 || lnum > curbuf->b_ml.ml_line_count + 1)
+	if (line == NULL || lnum > curbuf->b_ml.ml_line_count + 1)
 	    break;
 
 	/* When coming here from Insert mode, sync undo, so that this can be

src/ex_cmds2.c

@@ -1420,7 +1420,7 @@ check_due_timer(void)
 	    if (balloonEval != NULL)
 		general_beval_cb(balloonEval, 0);
 	}
-	else if (this_due > 0 && (next_due == -1 || next_due > this_due))
+	else if (next_due == -1 || next_due > this_due)
 	    next_due = this_due;
     }
 #endif

src/fileio.c

@@ -1392,7 +1392,7 @@ readfile(
 
 			/* If the crypt layer is buffering, not producing
 			 * anything yet, need to read more. */
-			if (size > 0 && decrypted_size == 0)
+			if (decrypted_size == 0)
 			    continue;
 
 			if (linerest == 0)

src/getchar.c

@@ -4119,7 +4119,7 @@ map_to_exists_mode(char_u *rhs, int mode, int abbr)
     mapblock_T	*mp;
     int		hash;
 # ifdef FEAT_LOCALMAP
-    int		expand_buffer = FALSE;
+    int		exp_buffer = FALSE;
 
     validate_maphash();
 
@@ -4134,14 +4134,14 @@ map_to_exists_mode(char_u *rhs, int mode, int abbr)
 		if (hash > 0)		/* there is only one abbr list */
 		    break;
 #ifdef FEAT_LOCALMAP
-		if (expand_buffer)
+		if (exp_buffer)
 		    mp = curbuf->b_first_abbr;
 		else
 #endif
 		    mp = first_abbr;
 	    }
 # ifdef FEAT_LOCALMAP
-	    else if (expand_buffer)
+	    else if (exp_buffer)
 		mp = curbuf->b_maphash[hash];
 # endif
 	    else
@@ -4154,9 +4154,9 @@ map_to_exists_mode(char_u *rhs, int mode, int abbr)
 	    }
 	}
 # ifdef FEAT_LOCALMAP
-	if (expand_buffer)
+	if (exp_buffer)
 	    break;
-	expand_buffer = TRUE;
+	exp_buffer = TRUE;
     }
 # endif
 

src/normal.c

@@ -2610,7 +2610,7 @@ do_mouse(
 			end_visual_mode();
 		}
 	    }
-	    else if (c1 < 0)
+	    else
 	    {
 		tabpage_T	*tp;
 

src/os_unix.c

@@ -441,7 +441,7 @@ mch_inchar(
 		    /* no character available within "wtime" */
 		    return 0;
 
-		if (wtime < 0)
+		else
 		{
 		    /* no character available within 'updatetime' */
 		    did_start_blocking = TRUE;

src/search.c

@@ -4071,7 +4071,7 @@ current_tagblock(
 	goto again;
     }
 
-    if (do_include || r < 1)
+    if (do_include)
     {
 	/* Include up to the '>'. */
 	while (*ml_get_cursor() != '>')

src/term.c

@@ -2361,7 +2361,7 @@ term_7to8bit(char_u *p)
     return 0;
 }
 
-#ifdef FEAT_GUI
+#if defined(FEAT_GUI) || defined(PROTO)
     int
 term_is_gui(char_u *name)
 {
@@ -2823,7 +2823,7 @@ term_get_winpos(int *x, int *y, varnumber_T timeout)
 
     winpos_x = prev_winpos_x;
     winpos_y = prev_winpos_y;
-    if (timeout < 10 && prev_winpos_y >= 0 && prev_winpos_y >= 0)
+    if (timeout < 10 && prev_winpos_y >= 0 && prev_winpos_x >= 0)
     {
 	/* Polling: return previous values if we have them. */
 	*x = winpos_x;

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1753,
 /**/
     1752,
 /**/