fix style checking: (#7222)

- (some) core files are astyled
- ci was only checking libraries
=> now everything is checked

cores/esp8266/core_esp8266_si2c.cpp

@@ -129,9 +129,11 @@ private:
         while (!timeout && !SCL_READ(twi_scl)) // outer loop is stretch duration up to stretch limit
         {
             if (yieldTimeout)   // inner loop yields every 5ms
+            {
                 yield();
             }
         }
+    }
 
     // Generate a clock "valley" (at the end of a segment, just before a repeated start)
     void twi_scl_valley(void);
@@ -161,21 +163,27 @@ static Twi twi;
 void Twi::setClock(unsigned int freq)
 {
     if (freq < 1000)  // minimum freq 1000Hz to minimize slave timeouts and WDT resets
+    {
         freq = 1000;
+    }
 
     preferred_si2c_clock = freq;
 
 #if F_CPU == FCPU80
 
     if (freq > 400000)
+    {
         freq = 400000;
+    }
     twi_dcount = (500000000 / freq);  // half-cycle period in ns
     twi_dcount = (1000 * (twi_dcount - 1120)) / 62500; // (half cycle - overhead) / busywait loop time
 
 #else
 
     if (freq > 800000)
+    {
         freq = 800000;
+    }
     twi_dcount = (500000000 / freq);  // half-cycle period in ns
     twi_dcount = (1000 * (twi_dcount - 560)) / 31250; // (half cycle - overhead) / busywait loop time
 

tests/ci/style_check.sh

@@ -12,4 +12,4 @@ ${org}/../restyle.sh
 git --version || true
 git submodule foreach --recursive 'git reset --hard'
 
-git diff --exit-code -- $TRAVIS_BUILD_DIR/libraries
+git diff --exit-code -- $TRAVIS_BUILD_DIR