Merge branch 'bugfix/driver_cleanup_log' into 'master'

drivers: remove file paths from log statements

Function name and error string are usually sufficient to find the place which has triggered an error. 

`__FILE__` macro generates a string which has absolute file name (with our build system), which add many long strings to the program binary.

Also change log tags to lower case to match style used elsewhere.

Fixes https://github.com/espressif/esp-idf/issues/126

See merge request !282

components/driver/ledc.c

@@ -21,12 +21,13 @@
 #include "driver/ledc.h"
 #include "esp_log.h"
 
-static const char* LEDC_TAG = "LEDC";
+static const char* LEDC_TAG = "ledc";
 static portMUX_TYPE ledc_spinlock = portMUX_INITIALIZER_UNLOCKED;
-#define LEDC_CHECK(a, str, ret_val) if (!(a)) {                                         \
-        ESP_LOGE(LEDC_TAG,"%s:%d (%s):%s", __FILE__, __LINE__, __FUNCTION__, str);    \
-        return (ret_val);                                                               \
-        }
+#define LEDC_CHECK(a, str, ret_val) \
+    if (!(a)) { \
+        ESP_LOGE(LEDC_TAG,"%s(%d): %s", __FUNCTION__, __LINE__, str); \
+        return (ret_val); \
+    }
 
 esp_err_t ledc_timer_set(ledc_mode_t speed_mode, ledc_timer_t timer_sel, uint32_t div_num, uint32_t bit_num, ledc_clk_src_t clk_src)
 {