lib: Handle a special case with str_to_list()

The current implementation can return an extra result at the end when
the string ends with a space. Fix this by adding a special case.

Signed-off-by: Simon Glass <sjg@chromium.org>

lib/strto.c

@@ -236,12 +236,14 @@ const char **str_to_list(const char *instr)
 		return NULL;
 
 	/* count the number of space-separated strings */
-	for (count = *str != '\0', p = str; *p; p++) {
+	for (count = 0, p = str; *p; p++) {
 		if (*p == ' ') {
 			count++;
 			*p = '\0';
 		}
 	}
+	if (p != str && p[-1])
+		count++;
 
 	/* allocate the pointer array, allowing for a NULL terminator */
 	ptr = calloc(count + 1, sizeof(char *));

test/str_ut.c

@@ -342,9 +342,7 @@ static int test_str_to_list(struct unit_test_state *uts)
 	ut_asserteq_str("space", ptr[3]);
 	ut_assertnonnull(ptr[4]);
 	ut_asserteq_str("", ptr[4]);
-	ut_assertnonnull(ptr[5]);
-	ut_asserteq_str("", ptr[5]);
-	ut_assertnull(ptr[6]);
+	ut_assertnull(ptr[5]);
 	str_free_list(ptr);
 	ut_assertok(ut_check_delta(start));