shell: add missing initialization of argv0_path

According to c6dfb39 (remote-curl: add missing initialization of
argv0_path, 2009-10-13), stand-alone programs (non-builtins)
must call git_extract_argv0_path(argv[0]) in order to help builds
that derive the installation prefix at runtime. Without this call,
the program segfaults (or raises an assertion failure).

Signed-off-by: Dima Sharov <[email protected]>
Acked-by: Johannes Sixt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Dima Sharov

shell.c

@@ -137,6 +137,8 @@ int main(int argc, char **argv)
 	int devnull_fd;
 	int count;
 
+	git_extract_argv0_path(argv[0]);
+
 	/*
 	 * Always open file descriptors 0/1/2 to avoid clobbering files
 	 * in die().  It also avoids not messing up when the pipes are