Remove trailings spaces from CBM-related asm files

libsrc/cbm510/_scrsize.s

@@ -6,7 +6,6 @@
 
         .export         screensize
         .import         SCREEN
-                              
+
         screensize      = SCREEN
 
-

libsrc/cbm510/kopen.s

@@ -3,10 +3,10 @@
 ;
 ; OPEN kernal call.
 ;
-; NOTE: The OPEN system call in the CBM610 kernal is different from the 
+; NOTE: The OPEN system call in the CBM610 kernal is different from the
 ; standard. It evaluates the carry flag and does a normal open if carry clear
 ; and some strange things (output sa 15 + name on IEC) if carry set. To be
-; compatible with our CBM file stuff, we have to clear the carry before 
+; compatible with our CBM file stuff, we have to clear the carry before
 ; calling the real OPEN.
 
         .export         OPEN
@@ -18,5 +18,3 @@
 
 .endproc
 
-
-

libsrc/cbm510/kudtim.s

@@ -3,7 +3,7 @@
 ;
 ; udtim routine for the 610. We will not check for the stop key here, since
 ; C programs will not use it.
-;                                  
+;
 
         .export         UDTIM
         .import         time: zp