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The pointer variable 'start' should be checked against NULL
right after detected it is not pointer to a space character,
otherwise the pointer variable 'end' must hold the wrong
address right after NULL if the cmdline containing trailing
whitespaces and deference the wrong address out of cmdline
string. this parsing code also been optimized and simplified.
Tracked-On: projectacrn#4250
Signed-off-by: Gary <gordon.king@intel.com>