avcodec/dovi_rpu: Use 64 bit in get_us/se_coeff()

Fixes: shift exponent 32 is too large for 32-bit type 'int'
Fixes: 63151/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5067531154751488

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/dovi_rpu.c

@@ -149,7 +149,7 @@ static inline uint64_t get_ue_coef(GetBitContext *gb, const AVDOVIRpuDataHeader
 
     case RPU_COEFF_FLOAT:
         fpart.u32 = get_bits_long(gb, 32);
-        return fpart.f32 * (1 << hdr->coef_log2_denom);
+        return fpart.f32 * (1LL << hdr->coef_log2_denom);
     }
 
     return 0; /* unreachable */
@@ -168,7 +168,7 @@ static inline int64_t get_se_coef(GetBitContext *gb, const AVDOVIRpuDataHeader *
 
     case RPU_COEFF_FLOAT:
         fpart.u32 = get_bits_long(gb, 32);
-        return fpart.f32 * (1 << hdr->coef_log2_denom);
+        return fpart.f32 * (1LL << hdr->coef_log2_denom);
     }
 
     return 0; /* unreachable */