GFS2: Use pr_<level> more consistently

Add pr_fmt, remove embedded "GFS2: " prefixes.
This now consistently emits lower case "gfs2: " for each message.

Other miscellanea around these changes:

o Add missing newlines
o Coalesce formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 584c757..a08c66e 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -7,6 +7,8 @@
  * of the GNU General Public License version 2.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/bio.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
@@ -175,8 +177,7 @@
 			break;
 		case Opt_debug:
 			if (args->ar_errors == GFS2_ERRORS_PANIC) {
-				pr_warn("GFS2: -o debug and -o errors=panic "
-				       "are mutually exclusive.\n");
+				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 				return -EINVAL;
 			}
 			args->ar_debug = 1;
@@ -228,21 +229,21 @@
 		case Opt_commit:
 			rv = match_int(&tmp[0], &args->ar_commit);
 			if (rv || args->ar_commit <= 0) {
-				pr_warn("GFS2: commit mount option requires a positive numeric argument\n");
+				pr_warn("commit mount option requires a positive numeric argument\n");
 				return rv ? rv : -EINVAL;
 			}
 			break;
 		case Opt_statfs_quantum:
 			rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 			if (rv || args->ar_statfs_quantum < 0) {
-				pr_warn("GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
+				pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
 				return rv ? rv : -EINVAL;
 			}
 			break;
 		case Opt_quota_quantum:
 			rv = match_int(&tmp[0], &args->ar_quota_quantum);
 			if (rv || args->ar_quota_quantum <= 0) {
-				pr_warn("GFS2: quota_quantum mount option requires a positive numeric argument\n");
+				pr_warn("quota_quantum mount option requires a positive numeric argument\n");
 				return rv ? rv : -EINVAL;
 			}
 			break;
@@ -259,8 +260,7 @@
 			break;
 		case Opt_err_panic:
 			if (args->ar_debug) {
-				pr_warn("GFS2: -o debug and -o errors=panic "
-					"are mutually exclusive.\n");
+				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 				return -EINVAL;
 			}
 			args->ar_errors = GFS2_ERRORS_PANIC;
@@ -279,7 +279,7 @@
 			break;
 		case Opt_error:
 		default:
-			pr_warn("GFS2: invalid mount option: %s\n", o);
+			pr_warn("invalid mount option: %s\n", o);
 			return -EINVAL;
 		}
 	}