logging/trivial: rename _nm_log() to _nm_log_impl()

The actual logging implementation is not supposed to be called
directly, because there are macros that capture the call site
information __FILE__, __LINE__, and G_STRFUNC.

Rename the function to make clear that this is the actual
implementation.

(cherry picked from commit 211d241ab0)

Conflicts:
	src/dhcp-manager/systemd-dhcp/nm-sd-adapt.h

src/dhcp-manager/systemd-dhcp/nm-sd-adapt.h

@@ -57,7 +57,7 @@ G_STMT_START { \
 	if (nm_logging_enabled (_l, LOGD_DHCP)) { \
 		const char *_location = strrchr (file "", '/'); \
 		\
-		_nm_log (_location ? _location + 1 : file, line, func, _l, LOGD_DHCP, 0, format, ## __VA_ARGS__); \
+		_nm_log_impl (_location ? _location + 1 : file, line, func, _l, LOGD_DHCP, 0, format, ## __VA_ARGS__); \
 	} \
 } G_STMT_END
 

src/nm-logging.c

@@ -357,14 +357,14 @@ nm_logging_enabled (NMLogLevel level, NMLogDomain domain)
 }
 
 void
-_nm_log (const char *file,
-         guint line,
-         const char *func,
-         NMLogLevel level,
-         NMLogDomain domain,
-         int error,
-         const char *fmt,
-         ...)
+_nm_log_impl (const char *file,
+              guint line,
+              const char *func,
+              NMLogLevel level,
+              NMLogDomain domain,
+              int error,
+              const char *fmt,
+              ...)
 {
 	va_list args;
 	char *msg;

src/nm-logging.h

@@ -105,7 +105,7 @@ typedef enum  { /*< skip >*/
 #define nm_log(level, domain, ...) \
     G_STMT_START { \
         if (nm_logging_enabled ((level), (domain))) { \
-            _nm_log (__FILE__, __LINE__, G_STRFUNC, (level), (domain), 0, ""__VA_ARGS__); \
+            _nm_log_impl (__FILE__, __LINE__, G_STRFUNC, (level), (domain), 0, ""__VA_ARGS__); \
         } \
     } G_STMT_END
 
@@ -136,14 +136,14 @@ typedef enum  { /*< skip >*/
     nm_log_ptr ((level), (domain), (self), __VA_ARGS__)
 
 
-void _nm_log (const char *file,
-              guint line,
-              const char *func,
-              NMLogLevel level,
-              NMLogDomain domain,
-              int error,
-              const char *fmt,
-              ...) __attribute__((__format__ (__printf__, 7, 8)));
+void _nm_log_impl (const char *file,
+                   guint line,
+                   const char *func,
+                   NMLogLevel level,
+                   NMLogDomain domain,
+                   int error,
+                   const char *fmt,
+                   ...) __attribute__((__format__ (__printf__, 7, 8)));
 
 const char *nm_logging_level_to_string (void);
 const char *nm_logging_domains_to_string (void);