rmtfs: Fix a couple of possible uninitialized variables usage

GCC version 13.2.1 20231205 complains about the following:

  cc -Wall -g -O2   -c -o storage.o storage.c
  In function ‘rmtfs_iovec’,
      inlined from ‘handle_rmtfs’ at rmtfs.c:403:4:
  rmtfs.c:224:12: warning: ‘is_write’ may be used uninitialized [-Wmaybe-uninitialized]
    224 |         if (is_write)
        |            ^
  rmtfs.c: In function ‘handle_rmtfs’:
  rmtfs.c:158:17: note: ‘is_write’ was declared here
    158 |         uint8_t is_write;
        |                 ^
  In function ‘rmtfs_iovec’,
      inlined from ‘handle_rmtfs’ at rmtfs.c:403:4:
  rmtfs.c:225:17: warning: ‘rmtfd’ may be used uninitialized [-Wmaybe-uninitialized]
    225 |                 storage_sync(rmtfd);
        |                 ^~~~~~~~~~~~~~~~~~~
  rmtfs.c: In function ‘handle_rmtfs’:
  rmtfs.c:154:23: note: ‘rmtfd’ was declared here
    154 |         struct rmtfd *rmtfd;
        |                       ^~~~~

Signed-off-by: Javier Martinez Canillas <[email protected]>

Author: martinezjavier

rmtfs.c

@@ -151,11 +151,11 @@ static void rmtfs_iovec(int sock, struct qrtr_packet *pkt)
 	struct rmtfs_iovec_resp resp = {};
 	struct rmtfs_iovec_req req = {};
 	DEFINE_QRTR_PACKET(resp_buf, 256);
-	struct rmtfd *rmtfd;
+	struct rmtfd *rmtfd = NULL;
 	uint32_t caller_id = 0;
 	size_t num_entries = 0;
 	off_t sector_base;
-	uint8_t is_write;
+	uint8_t is_write = 0;
 	off_t phys_base;
 	uint8_t force = 0;
 	unsigned txn;