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Details: - Exit early from libblis_test_amaxv_check() when the vector dimension (length) of x is 0. This allows the module to run when the testsuite driver passes in a problem size of 0. Thanks to Meghana Vankadari for alerting us to this issue via #459. - Note: All other testsuite modules appear to work with problem sizes of 0, except for the microkernel modules. I chose not to "fix" those modules because a failure (or segmentation fault, as happens in this case) is actually meaningful in that it alerts the developer that some microkernels cannot be used with k = 0. Specifically, the 'haswell' kernel set contains microkernels that preload elements of B. Those microkernels would need to be restructured to avoid preloading in order to support usage when k = 0.