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Libjpeg used in NetSurf for decoding of JPEG images handles exceptions using a pair of non-local jump functions: setjmp() and longjmp(). When a decompression context is created via a call to the function jpeg_create_decompress() the caller passes a structure jpeg_decompress_struct as a parameter. This structure should has a validly initialized jump buffer, so the initialization or other functions called in future can jump to the exception handling context. The jpeg backend of NetSurf now initializes libjpeg mistakenly: jump buffer is filled after the call to jpeg_create_decompress(). It results in jump to random addresses in the case of exception caught during operation of the function jpeg_create_decompress(). The patch moves the initialization of jump buffer before the call to jpeg_create_decompress(). Signed-off-by: Sergei Rogachev <rogachevsergei@gmail.com>