merge-ort: fix accidental strset<->strintmap

Both strset_for_each_entry and strintmap_for_each_entry are macros that
evaluate to the same thing, so they are technically interchangeable.
However, the intent is that we use the one matching the variable type we
are passing.  Unfortunately, I somehow mistakenly got one of these wrong
in 7bee6c1 (merge-ort: avoid recursing into directories when we
don't need to, 2021-07-16) -- possibly related to the fact that
relevant_sources was initially a strset and later refactored into a
strintmap.  Correct which macro we use.

Signed-off-by: Elijah Newren <[email protected]>

Author: newren

merge-ort.c

@@ -1517,8 +1517,8 @@ static int handle_deferred_entries(struct merge_options *opt,
 		struct strintmap copy;
 
 		/* Loop over the set of paths we need to know rename info for */
-		strset_for_each_entry(&renames->relevant_sources[side],
-				      &iter, entry) {
+		strintmap_for_each_entry(&renames->relevant_sources[side],
+					 &iter, entry) {
 			char *rename_target, *dir, *dir_marker;
 			struct strmap_entry *e;