get_remote_group(): handle remotes with single-character names

The code for splitting a whitespace-separated list of values in
"remotes.<name>" had an off-by-one error that caused it to skip over
remotes whose names consist of a single character.

Also remove unnecessary braces.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fetch.c

@@ -978,10 +978,9 @@ static int get_remote_group(const char *key, const char *value, void *priv)
 		/* split list by white space */
 		int space = strcspn(value, " \t\n");
 		while (*value) {
-			if (space > 1) {
+			if (space >= 1)
 				string_list_append(g->list,
 						   xstrndup(value, space));
-			}
 			value += space + (value[space] != '\0');
 			space = strcspn(value, " \t\n");
 		}