scsi: aacraid: Fix spelling of "its"

Use the possessive "its" instead of the contraction "it's" in user
messages.

Link: https://lore.kernel.org/r/20211223061119.18304-1-rdunlap@infradead.org
Cc: Adaptec OEM Raid Solutions <aacraid@microsemi.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/aachba.c

@@ -271,7 +271,7 @@ MODULE_PARM_DESC(msi, "IRQ handling."
 	" 0=PIC(default), 1=MSI, 2=MSI-X)");
 module_param(startup_timeout, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(startup_timeout, "The duration of time in seconds to wait for"
-	" adapter to have it's kernel up and\n"
+	" adapter to have its kernel up and\n"
 	"running. This is typically adjusted for large systems that do not"
 	" have a BIOS.");
 module_param(aif_timeout, int, S_IRUGO|S_IWUSR);