simpify state and make code 2% faster

reimar, dont hesitate to flame me for not sending patches and feel free to revert any or all of my changes to lzo.c if you dont like them

Originally committed as revision 7778 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/lzo.c

@@ -168,7 +168,7 @@ static inline void copy_backptr(LZOContext *c, int back, int cnt) {
  * LZO_INPUT_PADDING, out must provide LZO_OUTPUT_PADDING additional bytes
  */
 int lzo1x_decode(void *out, int *outlen, void *in, int *inlen) {
-    enum {COPY, BACKPTR} state = COPY;
+    int state= 0;
     int x;
     LZOContext c;
     c.in = in;
@@ -205,9 +205,7 @@ int lzo1x_decode(void *out, int *outlen, void *in, int *inlen) {
                     break;
                 }
             }
-        } else
-        switch (state) {
-            case COPY:
+        } else if(!state){
                 cnt = get_len(&c, x, 15);
                 copy(&c, cnt + 3);
                 x = GETB(c);
@@ -219,15 +217,13 @@ int lzo1x_decode(void *out, int *outlen, void *in, int *inlen) {
                     continue;
                 cnt = 1;
                 back = (1 << 11) + (GETB(c) << 2) + (x >> 2) + 1;
-                break;
-            case BACKPTR:
+        } else {
                 cnt = 0;
                 back = (GETB(c) << 2) + (x >> 2) + 1;
-                break;
         }
         copy_backptr(&c, back, cnt + 2);
+        state=
         cnt = x & 3;
-        state = cnt ? BACKPTR : COPY;
         if (cnt)
             copy(&c, cnt);
         x = GETB(c);