exfat: Use a more common logging style

Remove the direct use of KERN_<LEVEL> in functions by creating
separate exfat_<level> macros.

Miscellanea:

o Remove several unnecessary terminating newlines in formats
o Realign arguments and fit to 80 columns where appropriate

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
diff --git a/misc.c b/misc.c
index f363c5c..234a2d8 100644
--- a/misc.c
+++ b/misc.c
@@ -32,7 +32,7 @@
 		va_start(args, fmt);
 		vaf.fmt = fmt;
 		vaf.va = &args;
-		exfat_msg(sb, KERN_ERR, "error, %pV\n", &vaf);
+		exfat_err(sb, "error, %pV", &vaf);
 		va_end(args);
 	}
 
@@ -47,7 +47,7 @@
 			!(sb->s_flags & MS_RDONLY)) {
 		sb->s_flags |= MS_RDONLY;
 #endif
-		exfat_msg(sb, KERN_ERR, "Filesystem has been set read-only");
+		exfat_err(sb, "Filesystem has been set read-only");
 	}
 }