kernel-doc: fix new warnings in debugfs

Fix new kernel-doc warnings:

Warning(fs/debugfs/file.c:556): No description found for parameter 'nregs'
Warning(fs/debugfs/file.c:556): Excess function parameter 'mregs' description in 'debugfs_print_regs32'

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index f65d445..ef023ee 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -540,7 +540,7 @@
  * debugfs_print_regs32 - use seq_print to describe a set of registers
  * @s: the seq_file structure being used to generate output
  * @regs: an array if struct debugfs_reg32 structures
- * @mregs: the length of the above array
+ * @nregs: the length of the above array
  * @base: the base address to be used in reading the registers
  * @prefix: a string to be prefixed to every output line
  *