pkg/report: add test for kmemleak with crc hash

KMEMLEAK now prints a crc hash. Add a test to ensure we can properly parse it.

Author: pimyn-girgis

pkg/report/testdata/linux/report/751

@@ -0,0 +1,36 @@
+TITLE: memory leak in lookup_or_create_module_kobject
+TYPE: LEAK
+CORRUPTED: N
+
+BUG: memory leak
+unreferenced object 0xffff8882d78c9ea0 (size 96):
+  comm "syz.0.23", pid 5988, jiffies 4294941388
+  hex dump (first 32 bytes):
+    df 82 95 86 ff ff ff ff a8 9e 8c d7 82 88 ff ff  ................
+    a8 9e 8c d7 82 88 ff ff 00 00 00 00 00 00 00 00  ................
+  backtrace (crc c9a1c131):
+    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
+    slab_post_alloc_hook mm/slub.c:4951 [inline]
+    slab_alloc_node mm/slub.c:5245 [inline]
+    __kmalloc_cache_noprof+0x42f/0x5e0 mm/slub.c:5719
+    kmalloc_noprof include/linux/slab.h:957 [inline]
+    kzalloc_noprof include/linux/slab.h:1094 [inline]
+    lookup_or_create_module_kobject kernel/params.c:774 [inline]
+    lookup_or_create_module_kobject+0x57/0x110 kernel/params.c:764
+    module_add_driver+0x13c/0x1e0 drivers/base/module.c:46
+    bus_add_driver+0x148/0x280 drivers/base/bus.c:682
+    driver_register+0xb1/0x140 drivers/base/driver.c:249
+    usb_gadget_register_driver_owner+0x69/0xe0 drivers/usb/gadget/udc/core.c:1704
+    raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:595 [inline]
+    raw_ioctl+0xad7/0x10f0 drivers/usb/gadget/legacy/raw_gadget.c:1306
+    vfs_ioctl fs/ioctl.c:51 [inline]
+    __do_sys_ioctl fs/ioctl.c:597 [inline]
+    __se_sys_ioctl fs/ioctl.c:583 [inline]
+    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
+    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
+    do_syscall_64+0xa4/0x2c0 arch/x86/entry/syscall_64.c:94
+    entry_SYSCALL_64_after_hwframe+0x77/0x7f
+
+
+<<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>
+