Possible issues in output/spv/*.c

[John Darrington]

cppcheck flags these warnings (and a lot of other, harmless ones):

[spv-light-decoder.c:102]: (warning) %x in format string (no. 3) requires 
'unsigned int *' but the argument type is 'signed int *'.
[spv-light-decoder.c:922]: (style) Same expression on both sides of '||'.
[spv-writer.c:197]: (style) Obsolete function 'asctime' called. It is 
recommended to use 'strftime' instead.
[spvbin-helpers.c:194] -> [spvbin-helpers.c:183]: (warning) Either the 
condition 'if(p)' is redundant or there is possible null pointer dereference: p.

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