src: Add required space after "switch"

Change-Id: I85cf93e30606bc7838852bd300a369e79370629a
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29623
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/riscv/trap_handler.c

@@ -125,7 +125,7 @@ void trap_handler(trapframe *tf)
 		return;
 	}
 
-	switch(tf->cause) {
+	switch (tf->cause) {
 		case CAUSE_MISALIGNED_FETCH:
 		case CAUSE_FETCH_ACCESS:
 		case CAUSE_ILLEGAL_INSTRUCTION: