ban size == 0 for max/min

TODO

@@ -67,19 +67,6 @@
 
 
 
-- try:
-
-	$ vips max babe.v --x-array --size 0
-	Segmentation fault (core dumped)
-
-- try:
-
-	im = VIPS::Image.new(ARGV[0])
-	mask = im.less(240)
-	columns, rows = mask.project
-
-  with wtc.jpg, segv if libvips is compiled with -O, OK without
-
 - need to do mosaicing 
 
 - now vips_linear() has uchar output, can we do something with orc?

libvips/arithmetic/max.c

@@ -447,7 +447,7 @@ vips_max_class_init( VipsMaxClass *class )
 		_( "Number of maximum values to find" ),
 		VIPS_ARGUMENT_OPTIONAL_INPUT,
 		G_STRUCT_OFFSET( VipsMax, size ),
-		0, 1000000, 10 );
+		1, 1000000, 10 );
 
 	VIPS_ARG_BOXED( class, "out_array", 6, 
 		_( "Output array" ), 

libvips/arithmetic/min.c

@@ -450,7 +450,7 @@ vips_min_class_init( VipsMinClass *class )
 		_( "Number of minimum values to find" ),
 		VIPS_ARGUMENT_OPTIONAL_INPUT,
 		G_STRUCT_OFFSET( VipsMin, size ),
-		0, 1000000, 10 );
+		1, 1000000, 10 );
 
 	VIPS_ARG_BOXED( class, "out_array", 6, 
 		_( "Output array" ),