staging: mt29f_spinand: Remove unneeded else following return

Remove unnecessary else when there is a return statement in the
corresponding if block. Coccinelle patch used:
@rule1@
expression e1;
@@

        if (e1) { ... return ...; }
-       else{
	         ...
-	    }

@rule2@
expression e2;
statement s1;
@@

	if(e2) { ... return ...; }
-       else
		s1

Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>