Optimize matrix scanning (#343)

tmk_core/common/avr/suspend.c

@@ -114,9 +114,7 @@ bool suspend_wakeup_condition(void)
     matrix_power_up();
     matrix_scan();
     matrix_power_down();
-    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
-        if (matrix_get_row(r)) return true;
-    }
+    if (matrix_key_count()) return true;
     return false;
 }
 
@@ -146,4 +144,3 @@ ISR(WDT_vect)
     }
 }
 #endif
-