use __FILE__, not __BASE_FILE__

The intention was to use the file's basename, but __BASE_FILE__ means "the root
file that is being parsed and contains #include statements".

If we had a function using __BASE_FILE__ and that was defined in an #included
file, __BASE_FILE__ would indicate the first file where the #include is, and
not the file where the function is defined. __BASE_FILE__ works for us because
we don't ever include function definitions that log something, so __BASE_FILE__
always coincides with __FILE__ for our logging; but still __BASE_FILE__ is
semantically the wrong constant.

Related: OS#2740
Change-Id: Ibc1d3746f1876ac42d6b1faf0e5f83bd2283cdcc
diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index e68f618..3cae63d 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -55,17 +55,17 @@
 #define LOGPC(ss, level, fmt, args...) \
 	do { \
 		if (log_check_level(ss, level)) \
-			logp2(ss, level, __BASE_FILE__, __LINE__, 1, fmt, ##args); \
+			logp2(ss, level, __FILE__, __LINE__, 1, fmt, ##args); \
 	} while(0)
 
 /*! Log through the Osmocom logging framework with explicit source.
- *  If caller_file is passed as NULL, __BASE_FILE__ and __LINE__ are used
+ *  If caller_file is passed as NULL, __FILE__ and __LINE__ are used
  *  instead of caller_file and caller_line (so that this macro here defines
  *  both cases in the same place, and to catch cases where callers fail to pass
  *  a non-null filename string).
  *  \param[in] ss logging subsystem (e.g. \ref DLGLOBAL)
  *  \param[in] level logging level (e.g. \ref LOGL_NOTICE)
- *  \param[in] caller_file caller's source file string (e.g. __BASE_FILE__)
+ *  \param[in] caller_file caller's source file string (e.g. __FILE__)
  *  \param[in] caller_line caller's source line nr (e.g. __LINE__)
  *  \param[in] fmt format string
  *  \param[in] args variable argument list
@@ -74,13 +74,13 @@
 	LOGPSRCC(ss, level, caller_file, caller_line, 0, fmt, ##args)
 
 /*! Log through the Osmocom logging framework with explicit source.
- *  If caller_file is passed as NULL, __BASE_FILE__ and __LINE__ are used
+ *  If caller_file is passed as NULL, __FILE__ and __LINE__ are used
  *  instead of caller_file and caller_line (so that this macro here defines
  *  both cases in the same place, and to catch cases where callers fail to pass
  *  a non-null filename string).
  *  \param[in] ss logging subsystem (e.g. \ref DLGLOBAL)
  *  \param[in] level logging level (e.g. \ref LOGL_NOTICE)
- *  \param[in] caller_file caller's source file string (e.g. __BASE_FILE__)
+ *  \param[in] caller_file caller's source file string (e.g. __FILE__)
  *  \param[in] caller_line caller's source line nr (e.g. __LINE__)
  *  \param[in] cont continuation (1) or new line (0)
  *  \param[in] fmt format string
@@ -92,7 +92,7 @@
 			if (caller_file) \
 				logp2(ss, level, caller_file, caller_line, cont, fmt, ##args); \
 			else \
-				logp2(ss, level, __BASE_FILE__, __LINE__, cont, fmt, ##args); \
+				logp2(ss, level, __FILE__, __LINE__, cont, fmt, ##args); \
 		}\
 	} while(0)