Fix https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=8739 :

Move offset to end of line without assuming that we always have \r\n at the end of it

svn path=/trunk/; revision=49722

epan/dissectors/packet-imap.c

@@ -261,7 +261,7 @@ dissect_imap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 
 			}
 
-			offset += linelen+2; /* Skip over last line and \r\n at the end of it */
+			offset = next_offset; /* Skip over last line and \r\n at the end of it */
 		}
 	}
 }