Update core_esp8266_si2c.c (#4070)

* Update core_esp8266_si2c.c

Add 'clockCount' decrement, while-loop, twi_status()

* Update core_esp8266_si2c.c

Indents in changed function, removed superflous else

Author: mrwgx3

cores/esp8266/core_esp8266_si2c.c

@@ -198,17 +198,23 @@ unsigned char twi_readFrom(unsigned char address, unsigned char* buf, unsigned i
   return 0;
 }
 
-uint8_t twi_status(){           
-    if (SCL_READ()==0)     return I2C_SCL_HELD_LOW;       		//SCL held low by another device, no procedure available to recover
+uint8_t twi_status() {           
+    if (SCL_READ()==0)     
+        return I2C_SCL_HELD_LOW;             //SCL held low by another device, no procedure available to recover
     int clockCount = 20;                   
 
-    while (SDA_READ()==0 && clockCount>0){                      //if SDA low, read the bits slaves have to sent to a max
+    while (SDA_READ()==0 && clockCount>0) {                     //if SDA low, read the bits slaves have to sent to a max
+        --clockCount;
         twi_read_bit();                    
-        if (SCL_READ()==0) return I2C_SCL_HELD_LOW_AFTER_READ;  //I2C bus error. SCL held low beyond slave clock stretch time
+        if (SCL_READ()==0) 
+            return I2C_SCL_HELD_LOW_AFTER_READ;  //I2C bus error. SCL held low beyond slave clock stretch time
     }
 
-    if (SDA_READ()==0)     return I2C_SDA_HELD_LOW;       		//I2C bus error. SDA line held low by slave/another_master after n bits.
+    if (SDA_READ()==0)     
+        return I2C_SDA_HELD_LOW;             //I2C bus error. SDA line held low by slave/another_master after n bits.
 
-    if(!twi_write_start()) return I2C_SDA_HELD_LOW_AFTER_INIT;  //line busy. SDA again held low by another device. 2nd master?
-    else                   return I2C_OK;       				//all ok 
-}
+    if(!twi_write_start()) 
+        return I2C_SDA_HELD_LOW_AFTER_INIT;  //line busy. SDA again held low by another device. 2nd master?
+
+    return I2C_OK;                       //all ok 
+}