common/spl: fix endless loop in spl_fit_append_fdt()

Technically, commit 24bf44cf88e7 ("spl: fit: Do not fail immediately if
an overlay is not available") introduced that regression as the code
will never advance if spl_fit_get_image_name() will return an error. But
at that time, spl_fit_get_image_node() was used in spl_fit_append_fdt()
which calls fdt_subnode_offset() to get the image node. And I presume
the commit was about the latter failing gracefully and trying the next
one.

But with commit b13eaf3bb4e6 ("spl: fit: Add board level function to
decide application of DTO") that behavior changed and the loop in
spl_fit_append_fdt() no longer uses spl_fit_get_image_node() but
spl_fit_get_image_name() directly. Thus it doesn't make any sense to not
break the loop if that fails.

Also, the original use case of commit 24bf44cf88e7 ("spl: fit: Do not
fail immediately if an overlay is not available") is preserved because
spl_subnode_offset() is now called within the loop and errors are
handled gracefully (and advancing the index).

Fixes: b13eaf3bb4e6 ("spl: fit: Add board level function to decide application of DTO")
Signed-off-by: Michael Walle <[email protected]>

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