drm/i915/selftests: Always initialize err in igt_dmabuf_import_same_driver_lmem()

Clang warns:

drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:127:13: warning:
variable 'err' is used uninitialized whenever 'if' condition is false
[-Wsometimes-uninitialized]
        } else if (PTR_ERR(import) != -EOPNOTSUPP) {
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:138:9: note:
uninitialized use occurs here
        return err;
               ^~~
drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:127:9: note: remove
the 'if' if its condition is always true
        } else if (PTR_ERR(import) != -EOPNOTSUPP) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:95:9: note:
initialize the variable 'err' to silence this warning
        int err;
               ^
                = 0

The test is expected to pass if i915_gem_prime_import() returns
-EOPNOTSUPP so initialize err to zero in this case.

Fixes: cdb35d1e ("drm/i915/gem: Migrate to system at dma-buf attach time (v7)")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210824225427.2065517-3-nathan@kernel.org

drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c

@@ -128,6 +128,8 @@ static int igt_dmabuf_import_same_driver_lmem(void *arg)
 		pr_err("i915_gem_prime_import failed with the wrong err=%ld\n",
 		       PTR_ERR(import));
 		err = PTR_ERR(import);
+	} else {
+		err = 0;
 	}
 
 	dma_buf_put(dmabuf);