flowvar: shrink flowvar type by using padded space

src/flow-bit.h

@@ -29,6 +29,7 @@
 
 typedef struct FlowBit_ {
     uint8_t type; /* type, DETECT_FLOWBITS in this case */
+    uint8_t pad[3];
     uint32_t idx; /* name idx */
     GenericVar *next; /* right now just implement this as a list,
                        * in the long run we have think of something

src/flow-var.h

@@ -47,17 +47,17 @@ typedef struct FlowVarTypeInt_ {
 /** Generic Flowvar Structure */
 typedef struct FlowVar_ {
     uint8_t type;       /* type, DETECT_FLOWVAR in this case */
+    uint8_t datatype;
+    uint16_t keylen;
     uint32_t idx;       /* name idx */
     GenericVar *next;   /* right now just implement this as a list,
                          * in the long run we have think of something
                          * faster. */
-    uint8_t datatype;
     union {
         FlowVarTypeStr fv_str;
         FlowVarTypeInt fv_int;
     } data;
     uint8_t *key;
-    uint16_t keylen;
 } FlowVar;
 
 /** Flowvar Interface API */

src/util-var.h

@@ -47,12 +47,14 @@ enum VarTypes {
 
 typedef struct GenericVar_ {
     uint8_t type;
+    uint8_t pad[3];
     uint32_t idx;
     struct GenericVar_ *next;
 } GenericVar;
 
 typedef struct XBit_ {
     uint8_t type;       /* type, DETECT_XBITS in this case */
+    uint8_t pad[3];
     uint32_t idx;       /* name idx */
     GenericVar *next;
     uint32_t expire;