[PATCH] setup.c: Fix prefix_pathspec from looping pass end of string

[Andrew Wong <andrew.kw.w@gmail.com>]

The previous code was assuming length ends at either `)` or `,`, and was
not handling the case where strcspn returns length due to end of string.
So specifying ":(top" as pathspec will cause the loop to go pass the end
of string.

Signed-off-by: Andrew Wong <andrew.kw.w@gmail.com>
---
 setup.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/setup.c b/setup.c
index 1dee47e..f4c4e73 100644
--- a/setup.c
+++ b/setup.c
@@ -207,9 +207,11 @@ static const char *prefix_pathspec(const char *prefix, int prefixlen, const char
 		     *copyfrom && *copyfrom != ')';
 		     copyfrom = nextat) {
 			size_t len = strcspn(copyfrom, ",)");
-			if (copyfrom[len] == ')')
+			if (copyfrom[len] == '\0')
 				nextat = copyfrom + len;
-			else
+			else if (copyfrom[len] == ')')
+				nextat = copyfrom + len;
+			else if (copyfrom[len] == ',')
 				nextat = copyfrom + len + 1;
 			if (!len)
 				continue;
-- 
1.8.2.rc0.22.gb3600c3