scsi: megaraid_mm: Fix incorrect function name in header

Fixes the following W=1 kernel build warning(s):

drivers/scsi/megaraid/megaraid_mm.c:505: warning: expecting prototype for mraid_mm_attch_buf(). Prototype was for mraid_mm_attach_buf() instead

Link: https://lore.kernel.org/r/[e-mail]
Cc: Kashyap Desai <[e-mail]>
Cc: Sumit Saxena <[e-mail]>
Cc: Shivasharan S <[e-mail]>
Cc: "James E.J. Bottomley" <[e-mail]>
Cc: "Martin K. Petersen" <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/megaraid/megaraid_mm.c

···
 }
 
 /**
- * mraid_mm_attch_buf - Attach a free dma buffer for required size
+ * mraid_mm_attach_buf - Attach a free dma buffer for required size
  * @adp		: Adapter softstate
  * @kioc	: kioc that the buffer needs to be attached to
  * @xferlen	: required length for buffer