avcodec/bmp_parser: reset state

Fixes part of ticket 5598

Signed-off-by: Michael Niedermayer <[email protected]>
diff --git a/libavcodec/bmp_parser.c b/libavcodec/bmp_parser.c
index 8111ada..d2a04ef 100644
--- a/libavcodec/bmp_parser.c
+++ b/libavcodec/bmp_parser.c
@@ -69,8 +69,10 @@
                     next = i - 17;
                     state = 0;
                     break;
-                } else
+                } else {
+                    bpc->pc.state64 = 0;
                     goto restart;
+                }
             } else if (bpc->pc.frame_start_found)
                 bpc->pc.frame_start_found++;
         }