Fix compilation warnings.

... found by compiling them with gcc 2.95.

Signed-off-by: Junio C Hamano <junkio@cox.net>

commit.c

diff --git a/commit.c b/commit.c
index e51eda1..2f73cf3 100644
--- a/commit.c
+++ b/commit.c
@@ -357,7 +357,7 @@
 static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
 {
 	char *date;
-	unsigned int namelen;
+	int namelen;
 	unsigned long time;
 	int tz, ret;
 

diff.c

diff --git a/diff.c b/diff.c
index 9015c81..527cbf0 100644
--- a/diff.c
+++ b/diff.c
@@ -704,7 +704,7 @@
 			scale *= 10;
 			num = num * 10 + ch - '0';
 		}
-		*cp++;
+		cp++;
 	}
 	*cp_p = cp;