scsi: fix makefile for aic7(3*x)

Fix bug introduced by my latest fix to the aic7xxx Makefile.
Test build on x86 32 and 64 bit.
Without and with -j (parallel build)
Building firmaware is br0ken with O=... but this
is unrelated to this bug-fix.
Tested-by: NAdrian Bunk <bunk@kernel.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

drivers/scsi/aic7xxx/Makefile

@@ -44,8 +44,8 @@ clean-files += aic79xx_seq.h aic79xx_reg.h aic79xx_reg_print.c
 
 # Dependencies for generated files need to be listed explicitly
 
-$(addprefix $(src)/,$(aic7xxx-y:.o=.c)): $(obj)/aic7xxx_seq.h $(obj)/aic7xxx_reg.h
-$(addprefix $(src)/,$(aic79xx-y:.o=.c)): $(obj)/aic79xx_seq.h $(obj)/aic79xx_reg.h
+$(addprefix $(obj)/,$(aic7xxx-y)): $(obj)/aic7xxx_seq.h $(obj)/aic7xxx_reg.h
+$(addprefix $(obj)/,$(aic79xx-y)): $(obj)/aic79xx_seq.h $(obj)/aic79xx_reg.h
 
 aic7xxx-gen-$(CONFIG_AIC7XXX_BUILD_FIRMWARE)	:= $(obj)/aic7xxx_reg.h
 aic7xxx-gen-$(CONFIG_AIC7XXX_REG_PRETTY_PRINT)	+= $(obj)/aic7xxx_reg_print.c