use-of-uninitialized-value third_party/dav1d/src/looprestoration_tmpl.c:447:27 in selfguided_filter

Discover on ae08430f

==62496==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x5605f954af8e in selfguided_filter third_party/dav1d/src/looprestoration_tmpl.c:447:27
    #1 0x5605f95465bb in selfguided_c third_party/dav1d/src/looprestoration_tmpl.c:558:9
    #2 0x5605f954d5af in lr_stripe third_party/dav1d/src/lr_apply_tmpl.c:184:13
    #3 0x5605f954d5af in lr_sbrow third_party/dav1d/src/lr_apply_tmpl.c:261
    #4 0x5605f954c0fb in dav1d_lr_sbrow_16bpc third_party/dav1d/src/lr_apply_tmpl.c:283:9
    #5 0x5605f9576948 in dav1d_filter_sbrow_16bpc third_party/dav1d/src/recon_tmpl.c:1622:9
    #6 0x5605f948a9ff in dav1d_decode_frame third_party/dav1d/src/decode.c:2839:25
    #7 0x5605f948ed5e in dav1d_submit_frame third_party/dav1d/src/decode.c:3280:20
    #8 0x5605f94d3476 in dav1d_parse_obus third_party/dav1d/src/obu.c:1405:24
    #9 0x5605f9512b56 in dav1d_get_picture third_party/dav1d/src/lib.c:317:20
    #10 0x5605f9478254 in LLVMFuzzerTestOneInput third_party/dav1d/tests/libfuzzer/dav1d_fuzzer.c:129:19


SUMMARY: MemorySanitizer: use-of-uninitialized-value third_party/dav1d/src/looprestoration_tmpl.c:447:27 in selfguided_filter

poc-716bd48336e172bb613b14102a34853aaa4f5cbd93175d1265ee087fdf7c5930