Replace calls to strbuf_init(&foo, 0) with STRBUF_INIT initializer

Many call sites use strbuf_init(&foo, 0) to initialize local
strbuf variable "foo" which has not been accessed since its
declaration. These can be replaced with a static initialization
using the STRBUF_INIT macro which is just as readable, saves a
function call, and takes up fewer lines.

Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

fsck.c

@@ -307,9 +307,8 @@ int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
 {
 	va_list ap;
 	int len;
-	struct strbuf sb;
+	struct strbuf sb = STRBUF_INIT;
 
-	strbuf_init(&sb, 0);
 	strbuf_addf(&sb, "object %s:", obj->sha1?sha1_to_hex(obj->sha1):"(null)");
 
 	va_start(ap, fmt);