argv-array: drop "detach" code

The argv_array_detach function (and associated free() function) was
really only useful for transferring ownership of the memory to a "struct
child_process". Now that we have an internal argv_array in that struct,
there are no callers left.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/technical/api-argv-array.txt

@@ -53,11 +53,3 @@ Functions
 `argv_array_clear`::
 	Free all memory associated with the array and return it to the
 	initial, empty state.
-
-`argv_array_detach`::
-	Detach the argv array from the `struct argv_array`, transferring
-	ownership of the allocated array and strings.
-
-`argv_array_free_detached`::
-	Free the memory allocated by a `struct argv_array` that was later
-	detached and is now no longer needed.

argv-array.c

@@ -68,23 +68,3 @@ void argv_array_clear(struct argv_array *array)
 	}
 	argv_array_init(array);
 }
-
-const char **argv_array_detach(struct argv_array *array, int *argc)
-{
-	const char **argv =
-		array->argv == empty_argv || array->argc == 0 ? NULL : array->argv;
-	if (argc)
-		*argc = array->argc;
-	argv_array_init(array);
-	return argv;
-}
-
-void argv_array_free_detached(const char **argv)
-{
-	if (argv) {
-		int i;
-		for (i = 0; argv[i]; i++)
-			free((char **)argv[i]);
-		free(argv);
-	}
-}

argv-array.h

@@ -19,7 +19,5 @@ LAST_ARG_MUST_BE_NULL
 void argv_array_pushl(struct argv_array *, ...);
 void argv_array_pop(struct argv_array *);
 void argv_array_clear(struct argv_array *);
-const char **argv_array_detach(struct argv_array *array, int *argc);
-void argv_array_free_detached(const char **argv);
 
 #endif /* ARGV_ARRAY_H */