i965_asm: fix memleak

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/tools/i965_asm.c

@@ -82,6 +82,7 @@ i965_disasm_init(uint16_t pci_id)
    if (!gen_get_device_info(pci_id, devinfo)) {
       fprintf(stderr, "can't find device information: pci_id=0x%x\n",
               pci_id);
+      free(devinfo);
       return NULL;
    }