tools/hv: Add memory allocation check in hv_fcopy_start

Added error handling for memory allocation failures
of file_name and path_name.

Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Tested-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Link: https://lore.kernel.org/r/20240906091333.11419-1-zhujun2@cmss.chinamobile.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240906091333.11419-1-zhujun2@cmss.chinamobile.com>