Fix compiler warnings on bitfields

Author: Andras Fekete

src/wp_rsa_asym.c

@@ -76,7 +76,7 @@ typedef struct wp_RsaAsymCtx {
     /** wolfSSL id of MGF operation to perform when padding mode is PSS. */
     int mgf;
     /** Indicates that the MGF id has been set explicitly. */
-    int mgfSet:1;
+    unsigned int mgfSet:1;
     /** Label to use with OAEP. */
     unsigned char* label;
     /** Length of label. */

src/wp_rsa_sig.c

@@ -89,7 +89,7 @@ typedef struct wp_RsaSigCtx {
     /** wolfSSL id of MGF operation to perform when padding mode is PSS. */
     int mgf;
     /** Indicates that the MGF id has been set explicitly. */
-    int mgfSet:1;
+    unsigned int mgfSet:1;
 
     /** Property query string. */
     char* propQuery;

test/unit.h

@@ -64,16 +64,16 @@ void print_buffer(const char *desc, const unsigned char *buffer, size_t len);
 
 typedef int (*TEST_FUNC)(void *data);
 typedef struct TEST_CASE {
-    const char *name;
-    TEST_FUNC   func;
-    void       *data;
-    int         err;
-    int         run:1;
-    int         done:1;
+    const char   *name;
+    TEST_FUNC     func;
+    void         *data;
+    int           err;
+    unsigned int  run:1;
+    unsigned int  done:1;
 #ifdef TEST_MULTITHREADED
-    int         attempted:1;
-    pthread_t   thread;
-    int         cnt;
+    unsigned int  attempted:1;
+    pthread_t     thread;
+    int           cnt;
 #endif
 } TEST_CASE;