device.h: Add missing inline to #ifndef CONFIG_PRINTK dev_vprintk_emit

Also add __printf() verification for format string.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/device.h

@@ -895,8 +895,9 @@ extern const char *dev_driver_string(const struct device *dev);
 
 #ifdef CONFIG_PRINTK
 
-extern int dev_vprintk_emit(int level, const struct device *dev,
-			    const char *fmt, va_list args);
+extern __printf(3, 0)
+int dev_vprintk_emit(int level, const struct device *dev,
+		     const char *fmt, va_list args);
 extern __printf(3, 4)
 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
 
@@ -920,8 +921,9 @@ int _dev_info(const struct device *dev, const char *fmt, ...);
 
 #else
 
-static int dev_vprintk_emit(int level, const struct device *dev,
-			    const char *fmt, va_list args)
+static inline __printf(3, 0)
+int dev_vprintk_emit(int level, const struct device *dev,
+		     const char *fmt, va_list args)
 { return 0; }
 static inline __printf(3, 4)
 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)