drivers/video/fbdev/sis: Add missing else

The surrounding code and the fact that the previous two if's are
rendered useless without this "else" (since SIS_340==55 and XGI_20==75
are greater than SIS_661==15) suggests that the "else" is indeed
missing.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/sis/init.c

@@ -1511,7 +1511,7 @@ SiS_Get310DRAMType(struct SiS_Private *SiS_Pr)
       } else if(SiS_Pr->ChipType >= SIS_340) {
 	 /* TODO */
 	 data = 0;
-      } if(SiS_Pr->ChipType >= SIS_661) {
+      } else if(SiS_Pr->ChipType >= SIS_661) {
 	 if(SiS_Pr->SiS_ROMNew) {
 	    data = ((SiS_GetReg(SiS_Pr->SiS_P3d4,0x78) & 0xc0) >> 6);
 	 } else {