staging: sm750fb: coding style global ERROR fixes

kernel coding style fixes for below messages from
scripts/checkpatch.pl

ERROR: do not initialise globals to 0 or NULL
Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/ddk750_help.c

 #include "ddk750_help.h"
 
-void __iomem *mmio750 = NULL;
-char revId750 = 0;
-unsigned short devId750 = 0;
+void __iomem *mmio750;
+char revId750;
+unsigned short devId750;
 
 /* after driver mapped io registers, use this function first */
 void ddk750_set_mmio(void __iomem *addr, unsigned short devId, char revId)

drivers/staging/sm750fb/sm750.c

@@ -24,7 +24,7 @@
 
 #include "modedb.h"
 
-int smi_indent = 0;
+int smi_indent;
 
 
 /*
@@ -47,9 +47,9 @@ static int g_noaccel;
 static int g_nomtrr;
 static const char *g_fbmode[] = {NULL, NULL};
 static const char *g_def_fbmode = "800x600-16@60";
-static char *g_settings = NULL;
+static char *g_settings;
 static int g_dualview;
-static char *g_option = NULL;
+static char *g_option;
 
 
 static const struct fb_videomode lynx750_ext[] = {