staging: sm750fb: Fix of long line in makefile variable

A simple fix of long line in makefile variable assignment.
Found using checkpatch.pl.
Signed-off-by: R Veera Kumar <vkor@vkten.in>
Link: https://lore.kernel.org/r/20200319095024.GA2970@tulip.localSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_FB_SM750)	+= sm750fb.o
 
-sm750fb-objs		:= sm750.o sm750_hw.o sm750_accel.o sm750_cursor.o ddk750_chip.o ddk750_power.o ddk750_mode.o
-sm750fb-objs		+= ddk750_display.o ddk750_swi2c.o ddk750_sii164.o ddk750_dvi.o ddk750_hwi2c.o
+sm750fb-objs		:= sm750.o sm750_hw.o sm750_accel.o sm750_cursor.o \
+			   ddk750_chip.o ddk750_power.o ddk750_mode.o \
+			   ddk750_display.o ddk750_swi2c.o ddk750_sii164.o \
+			   ddk750_dvi.o ddk750_hwi2c.o