board/svm_sc8xx/svm_sc8xx.c: Fix GCC 4.6 build warning

Fix:
svm_sc8xx.c: In function 'checkboard':
svm_sc8xx.c:83:6: warning: variable 'board_type' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>

board/svm_sc8xx/svm_sc8xx.c

@@ -80,15 +80,12 @@ int checkboard(void)
 	char buf[64];
 	int i;
 	int l = getenv_f("serial#", buf, sizeof(buf));
-	int board_type;
 
 	if (l < 0 || strncmp(buf, "SVM8", 4)) {
 		printf("### No HW ID - assuming SVM SC8xx\n");
 		return (0);
 	}
 
-	board_type = 1;
-
 	for (i = 0; i < l; ++i) {
 		if (buf[i] == ' ')
 			break;
@@ -97,7 +94,7 @@ int checkboard(void)
 
 	putc('\n');
 
-	return (0);
+	return 0;
 }
 
 /* ------------------------------------------------------------------------- */