socrates: Fix a misleading indentation warning

With gcc-6 and later we see a warning about the fact that we have a
construct of "if (test);\n\tstatement".  Upon reviewing the code, the
intention here is as the compiler suggests, we only want to execute the
indented statement if the test was true.

Cc: Sergei Poselenov <sposelenov@emcraft.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

board/socrates/socrates.c

@@ -378,7 +378,7 @@ static void board_backlight_brightness(int br)
 
 		/* LEDs on */
 		reg = in_be32((void *)(CONFIG_SYS_FPGA_BASE + 0x0c));
-		if (!(reg & BACKLIGHT_ENABLE));
+		if (!(reg & BACKLIGHT_ENABLE))
 			out_be32((void *)(CONFIG_SYS_FPGA_BASE + 0x0c),
 				 reg | BACKLIGHT_ENABLE);
 	} else {