Tomas Janousek a7170cef81 backend: driver: fix memory leak (r2 not freed)
Fixes the following memory leaks reported by valgrind:

    96 bytes in 1 blocks are definitely lost in loss record 54 of 111
       at 0x483577F: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
       by 0x49DB0DD: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49D8FB4: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49DA63E: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49DA751: xcb_wait_for_reply (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x14B266: detect_driver (driver.c:34)
       by 0x119949: session_init (compton.c:1879)
       by 0x11AEF0: main (compton.c:2285)

    96 bytes in 1 blocks are definitely lost in loss record 55 of 111
       at 0x483577F: malloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
       by 0x49DB0DD: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49D8FB4: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49DA63E: ??? (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x49DA751: xcb_wait_for_reply (in /usr/lib/x86_64-linux-gnu/libxcb.so.1.1.0)
       by 0x14B266: detect_driver (driver.c:34)
       by 0x11795E: redir_start (compton.c:1202)
       by 0x115C76: paint_preprocess (compton.c:629)
       by 0x1182BD: _draw_callback (compton.c:1380)
       by 0x1184D0: draw_callback (compton.c:1426)
       by 0x49BF292: ev_invoke_pending (in /usr/lib/x86_64-linux-gnu/libev.so.4.0.0)
       by 0x49C3344: ev_run (in /usr/lib/x86_64-linux-gnu/libev.so.4.0.0)
2019-09-20 10:15:59 +02:00
..
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x.c
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x.h
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