fixed warning

src/std/string.c

@@ -267,17 +267,20 @@ HL_PRIM vbyte *hl_url_encode( vbyte *str, int *len ) {
 			} else if( c < 0x800 ) {
 				hl_buffer_hex(b, 0xC0|(c>>6));
 				hl_buffer_hex(b, 0x80|(c&63));
-			} else if( c >= 0xD800 && c <= 0xDBFF && (sur = (unsigned)*cstr) && sur >= 0xDC00 && sur < 0xDFFF ) {
-				cstr++;
-				c = ((((int)c - 0xD800) << 10) | ((int)sur - 0xDC00)) + 0x10000;
-				hl_buffer_hex(b, 0xF0|(c>>18));
-				hl_buffer_hex(b, 0x80|((c >> 12) & 63));
-				hl_buffer_hex(b, 0x80|((c >> 6) & 63));
-				hl_buffer_hex(b, 0x80|(c & 63));
-			} else{
-				hl_buffer_hex(b, 0xE0|(c>>12));
-				hl_buffer_hex(b, 0x80|((c>>6)&63));
-				hl_buffer_hex(b, 0x80|(c&63));
+			} else if( c >= 0xD800 && c <= 0xDBFF ) {
+				sur = (unsigned)*cstr;
+				if( sur >= 0xDC00 && sur < 0xDFFF ) {
+					cstr++;
+					c = ((((int)c - 0xD800) << 10) | ((int)sur - 0xDC00)) + 0x10000;
+					hl_buffer_hex(b, 0xF0|(c>>18));
+					hl_buffer_hex(b, 0x80|((c >> 12) & 63));
+					hl_buffer_hex(b, 0x80|((c >> 6) & 63));
+					hl_buffer_hex(b, 0x80|(c & 63));
+				} else {
+					hl_buffer_hex(b, 0xE0|(c>>12));
+					hl_buffer_hex(b, 0x80|((c>>6)&63));
+					hl_buffer_hex(b, 0x80|(c&63));
+				}
 			}
 		}
 	}