sh: null check signame list since sig 0 is not valid

Change-Id: I1b293246ea1d822e098d0581830500e93633a879
Signed-off-by: Dima Zavin <dima@android.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/sh/trap.c b/sh/trap.c
index 7cb5201c..dcd76ac7 100644
--- a/sh/trap.c
+++ b/sh/trap.c
@@ -100,7 +100,7 @@ signame_to_signum(const char *p)
 		p += 3;
 
 	for (i = 0; i < NSIG; ++i)
-		if (strcasecmp (p, sys_signame[i]) == 0)
+		if (sys_signame[i] && (strcasecmp (p, sys_signame[i]) == 0))
 			return i;
 	return -1;
 }