chomp: Check for beginning of string while removing \n's

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/chomp.c

@@ -39,7 +39,7 @@ char *chomp(char *str)
 	}
 
 	p = str + strlen(str) - 1;
-        while (*p == '\n')
+        while (p >= str && *p == '\n')
 		*p-- = 0;
 
 	return str;