graphparser: add a NULL check on the argument passed to strstr
Fix crash in create_filter() which occurrs if a scale filter with no
args is provided.
Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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Fix crash in create_filter() which occurrs if a scale filter with no
args is provided.
Signed-off-by: NAnton Khirnov <anton@khirnov.net>