equipment: sanitize 'ws_info' loop limits

Instead of a constant or a macro for the maximum
number of 'ws_info' elements the 100 literal was used.

Define MAX_WS_INFO in dive.h and use it everywhere.

Also clamp loops that iterate `ws_info' to MAX_WS_INFO.
Prevents potential out-of-bounds reading, similarly to
the previous commit about 'tank_info'.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

core/dive.h

@@ -275,6 +275,7 @@ struct divecomputer {
 #define MAX_CYLINDERS (20)
 #define MAX_WEIGHTSYSTEMS (6)
 #define MAX_TANK_INFO (100)
+#define MAX_WS_INFO (100)
 #define W_IDX_PRIMARY 0
 #define W_IDX_SECONDARY 1
 
@@ -944,7 +945,7 @@ struct ws_info_t {
 	const char *name;
 	int grams;
 };
-extern struct ws_info_t ws_info[100];
+extern struct ws_info_t ws_info[MAX_WS_INFO];
 
 extern bool cylinder_nodata(const cylinder_t *cyl);
 extern bool cylinder_none(void *_data);