model: add more locking, and resource handler #1
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To obtain more a precise Coverity analysis, we add more functions of the kernel to the Coverity model. This way, the analysis finds more problematic code path.
Besides adding several locking and memory allocation families, this change also modifies the IS_ERR_OR_NULL function model. When freeing the pointer in this function, many double-free patterns have been reported. Without this change, these problems have not been seen, and we did not loose any other irrelevant defects.