scripts/gdb: ensure the absolute path is generated on initial source

Post 'make scripts_gdb' a symbolic link to scripts/gdb/vmlinux-gdb.py is
created.  Currently 'os.path.dirname(__file__)' does not generate the
absolute path to scripts/gdb resulting in the following:

    (gdb) source vmlinux-gdb.py
    Traceback (most recent call last):
      File "scripts/gdb/vmlinux-gdb.py", line 25, in <module>
	import linux.utils
    ModuleNotFoundError: No module named 'linux'

This patch ensures that the absolute path to scripts/gdb in relation to
the given file is generated so each module can be located accordingly.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Aaron Tomlin <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Cc: Jan Kiszka <[email protected]>
Cc: Kieran Bingham <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions