[V0.10] Fix potential memory leak in vnc_clip.c #2338

Job	Run time
code formatting check	14s
cppcheck	3m 51s
min features with gcc	2m 12s
min features with g++	2m 34s
min features with clang	2m 15s
max features with gcc	2m 52s
max features with g++	2m 7s
max features with clang	3m 34s
max features with gcc and DEBUG	2m 36s
max features with gcc for 32-bit arch (legacy OS)	1m 33s
max features with g++ for 32-bit arch (legacy OS)	1m 25s
max features with clang for 32-bit arch (legacy OS)	1m 40s
	26m 53s

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